PDFCrack - A Password Recovery Tool for PDF-files(Windows version) About PDFCrack PDFCrack is a GNU/Linux (other POSIX-compatible systems should work too) tool for recovering passwords and content from PDF-files. It is small, command line driven without external dependencies. The application is Open Source (GPL). Features Supports the standard security handler (revision 2, 3 and 4) on all known PD