peepdf – Analyze & Modify PDF Files

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 peepdf – Analyze & Modify PDF Files

peepdf is a Python tool to explore PDF files in order to find out if the file can be harmful or not. The aim of this tool is to provide all the necessary components that a security researcher could need in a PDF analysis without using 3 or 4 tools to make all the tasks. With peepdf it's possible to see all the objects in the document showing the suspicious elements, supports all the most used filters and encodings, it can parse different versions of a file, object streams and encrypted files. With the installation of PyV8 and Pylibemu it provides Javascript and shellcode analysis wrappers too. Apart of this it's able to create new PDF files and to modify/obfuscate existent ones.


The main functionalities of peepdf are the following:


Analysis:


Decodings: hexadecimal, octal, name objects

More used filters

References in objects and where an object is referenced

Strings search (including streams)

Physical structure (offsets)

Logical tree structure

Metadata

Modifications between versions (changelog)

Compressed objects (object streams)

Analysis and modification of Javascript (PyV8): unescape, replace, join

Shellcode analysis (Libemu python wrapper, pylibemu)

Variables (set command)

Extraction of old versions of the document

Easy extraction of objects, Javascript code, shellcodes (>, >>, >>)

Checking hashes on VirusTotal

Creation/Modification:


Basic PDF creation

Creation of PDF with Javascript executed wen the document is opened

Creation of object streams to compress objects

Embedded PDFs

Strings and names obfuscation

Malformed PDF output: without endobj, garbage in the header, bad header...

Filters modification

Objects modification

Execution modes:


Simple command line execution

Powerful interactive console (colorized or not)

Batch mode

TODO:


Embedded PDFs analysis

Improving automatic Javascript analysis

GUI

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