This guide shows you how to Crack a PDF password using FreeBSD and Ubuntu Linux. It does not provide any method of cracking the password directly (via brute-force) using any other software. Crack PDF Passwords using Linux or FreeBSD — Linux If you want to crack passwords directly, then this is another tutorial that might be of interest, because it shows you how to use the Crack CLI tool, to get your password without opening the PDF file. Crack PDF using Linux, Linux2 and FreeBSD — Linux Crack PDF using Linux, Linux2 and FreeBSD — FreeBSD Crack PDF Password with Morris Linux — Morris Linux is a Linux operating system that has been ported to a BSD-like operating system, and so was used as a reference and base model for the development of the Crack command-line tool used in the following tutorials. Crack PDF using Morris Linux — Crack PDF using Morris Linux — Crack using Morris Linux Crack PDF via Crack (Linux) The official Crack command-line tool, that is also available as an optional extra in Kali Linux 7.2's packages are used to crack, the password of a PDF file. The crack tool is able to open a number of password-protected PDF files and search for the corresponding file of a certain password, or, to use the word “crack” it has the capability to convert any text-entry, form-able file format that is provided to a PDF reader to a form-able, or ASCII, file in a password-protected PDF file. Crack Password (Windows / Linux / FreeBSD) Crack Password (Windows / Linux / FreeBSD) — crack.exe Crack Password or Password Reset — Linux / FreeBSD / OS X This simple tool allows you to automatically crack a password using all available dictionary words or phrases you supplied, provided they were entered in the correct order. Note: the original paper from which this post was taken, has since been retracted due to plagiarism. We advise you to read this new post instead. The tool has been improved and re-written in Python3 (that was also provided by the paper), but the basic idea and the code is nearly the same. So, the author still doesn't deserve credit for this.