PDFCrack is a tool for recovering passwords and content from PDF-files.
It is small, command line driven without external dependencies.

Features:

* Supports the standard security handler (revision 2, 3 and 4) on all
known PDF-versions.
* Supports cracking both owner and userpasswords.
* Both wordlists and bruteforcing the password is supported.
* Simple permutations (currently only trying first character as Upper
Case).
* Save/Load a running job.
* Simple benchmarking.
* Optimised search for owner-password when user-password is known.

This is PDFCrack multi-core and multi-computer extension with periodic
autosaving of progress.

Authors:
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Henning Norén
Andreas Meier
Michael Kuhn