Gui Based Disassemble Tool For Mac

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Active4 months ago

What tool do you recommend for inspecting PDF files?

Use case: I'm trying to programmatically generate PDF files (using iText). I'm having trouble achieving certain layouts, but I have PDF files with text laid out the way I want (generated from Word). I would like to reverse engineer how they do it.

PDF Inspector seems to be good, but I'm looking for something for Windows.

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10 Answers

Adobe Acrobat has a very cool but rather well hidden mode allowing you to inspect PDF files. I wrote a blog article explaining it at https://blog.idrsolutions.com/2009/04/viewing-pdf-objects/

Markus Jarderot
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mark stephensmark stephens

Besides the GUI-based tools mentioned in the other answers, there are a few command line tools which can transform the original PDF source code into a different representation which lets you inspect the (now modified file) with a text editor. All of the tools below work on Linux, Mac OS X, other Unix systems or Windows.

qpdf (my favorite)

Use qpdf to uncompress (most) object's streams and also dissect ObjStm objects into individual indirect objects:

qpdf describes itself as a tool that does 'structural, content-preserving transformations on PDF files'.

Then just open + inspect the uncompressed-qpdf.pdf file in your favorite text editor. Most of the previously compressed (and hence, binary) bytes will now be plain text.

mutool

There is also the mutool command line tool which comes bundled with the MuPDF PDF viewer (which is a sister product to Ghostscript, made by the same company, Artifex). The following command does also uncompress streams and makes them more easy to inspect through a text editor:

podofouncompress

PoDoFo is an FreeSoftware/OpenSource library to work with the PDF format and it includes a few command line tools, including podofouncompress. Use it like this to uncompress PDF streams:

peepdf.py

PeePDF is a Python-based tool which helps you to explore PDF files. Its original purpose was for research and dissection of PDF-based malware, but I find it useful also to investigate the structure of completely benign PDF files.

It can be used interactively to 'browse' the objects and streams contained in a PDF.

I'll not give a usage example here, but only a link to its documentation:

pdfid.py and pdf-parser.py

pdfid.py and pdf-parser.py are two PDF tools by Didier Stevens written in Python.

Their background is also to help explore malicious PDFs -- but I also find it useful to analyze the structure and contents of benign PDF files.

Gui Based Disassembly Tool For Mac

Here is an example how I would extract the uncompressed stream of PDF object no. 5 into a *.dump file:

Final notes

  1. Please note that some binary parts inside a PDF are not necessarily uncompressible (or decode-able into human readable ASCII code), because they are embedded and used in their native format inside PDFs. Such PDF parts are JPEG images, fonts or ICC color profiles.

  2. If you compare above tools and the command line examples given, you will discover that they do NOT all produce identical outputs. The effort of comparing them for their differences in itself can help you to better understand the nature of the PDF syntax and file format.

Jeroen Wiert Pluimers
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Kurt PfeifleKurt Pfeifle
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I use iText RUPS(Reading and Updating PDF Syntax) in Linux. Since it's written in Java, it works on Windows, too. You can browse all the objects in PDF file in a tree structure. It can also decode Flate encoded streams on-the-fly to make inspecting easier.

Here is a screenshot:

Amedee Van Gasse
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gkcngkcn

I've used PDFBox with good success. Here's a sample of what the code looks like (back from version 0.7.2), that likely came from one of the provided examples:

Kaleb PedersonKaleb Pederson
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PDFXplorer from O2 Solutions does an outstanding job of displaying the internals.

(Free, distracting banner at the bottom).

PierrePierre

The object viewer in Acrobat is good but Windjack Solution's PDF Canopener allows better inspection with an eyedropper for selecting objects on page. Also permits modifications to be made to PDF.

Dwight KellyDwight Kelly
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There is also another option. Adobe Acrobat Pro is also able to display the internal tree structure of the PDF.

  1. Open Preflight
  2. Go to Options (right upper corner)
  3. Internal PDF Structure
Based

On top Adobe Acrobat Pro can also display the internal structure of the Document Fonts in the PDF most of other 'PDF tree structure viewer' don't have this otion

VadimoVadimo
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If you want to work programmatically from within Python, pdfminer is a good option. It allows you to work with PDF structure in memory as an object hierarchy or serialize it as XML.

W.P. McNeillW.P. McNeill
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PDF Analyzer is similar to PDFXplorer, but it has more options.It is also free after a single registration.

juFojuFo
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My sugession is Foxit PDF Reader which is very helpful to do important text editing work on pdf file.

nifCodynifCody
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Not the answer you're looking for? Browse other questions tagged pdf or ask your own question.

We have another GUI-based tool which will not only Jailbreak the iPhone OS v1.1.1 appropriately named 'iJailBreak for iPhone' and will also install the Installer.app which opens the door for you to install the unauthorized third-party iPhone applications fairly easily, to make the iPhone yours.

iJailBreak for the iPhone released by iPhone hacker, Brian, is based on AriX’s, iJailbreak, a GUI based tool that was released for iPod Touch.

Mac users seem to be the pampered lot by the iPhone hacking community, we have already seen iNdependece v1.2.4, a GUI-based tool to jailbreak iPhone OS v1.1.1 with an easy-to-use interface.

We have another GUI-based tool appropriately named 'iJailBreak for iPhone' which will not only Jailbreak the iPhone OS v1.1.1 but will also install the Installer.app which opens the door to install unauthorized third-party iPhone applications fairly easily.

Brian gives credit to Arix, a 13-year-old developer, for the iPhone version of iJailBreak. The 13-year old old developer had released iJailBreak for iPod touch but had been kind enough to also release the source code of his tool, which seems to have been used by Brian for the iPhone version.

However, unlike the iJailbreak for iPod Touch which is a Universal binary i.e. works on both PowerPC and Intel Macs, iJailBreak for iPhone only works with Intel-based Macs.

But before you get all excited, after going through the information available it appears that just like TouchFree, iJailBreak too internally makes use of the TIFF vulnerability found in the iPhone OS v1.1.1 firmware’s mobile Safari which is essentially a security flaw and hence not the recommended method of jailbreaking the iPhone. So do remember as always if you try this out like all other hacks its at your own risk.

The instructions to jailbreak your iPhone OS v1.1.1 as can be seen below seem fairly straightforward:

1. Download the file.
2. Unzip it to your desktop.
3. copy or move the folder to your applications folder.
4. Have your iPhone plugged in to the computer and iTunes closed.
5. Double click the iJailbreak for iPhone application in the iJailbreak folder in your applications folder.
6. Total time can be around 10 minutes, be patient.

Here are certain things you need to remember before trying this out:

1. You have an unmoddified iPhone v1.1.1.
2. You do not have iTunes open.
3. You have the iJailbreak FOLDER installed in your Applications folder (and it has a 'resources' folder inside it.
4. You run the Safari crash without unplugging and plugging in the iPhone (leave it plugged in the whole time).
5. You do not do anything else with the phone after it crashes.
6. And maybe as an extra step, you restart the phone before you start all of this.

So like other jailbreaking methods this works only on a virgin iPhone i.e. currently only applicable for all those who had bought their new iPhones recently with OS v1.1.1 running on it or iPhones that were upgraded from 1.0.2 to 1.1.1 but had NEVER unlocked their iPhone.

In case you are not aware, all those you had unlocked their iPhone running on OS v1.0.2 will need to wait for a bit longer as the iPhone Dev Team is currently working on a “re-virginizer” which is essentially a tool to revert your iPhone back to factory settings i.e. locked state after which I guess you should be able to use anySIM v1.1 to unlock the iPhone. I am hearing that the release of the tool is imminent (read here at iPhone Hacks, Instructions to Re-Virginize iPhone OS v1.0.2 shows up but Not an Official iPhone Dev Team Release).

Mdt : Magazine Disassembly Tool For Glocks

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