Recover PDF Password is a password cracking app for the Mac. It can be used to recover passwords that prevent you from opening a PDF file.
One great thing about this app is that it REALLY lets you customize these attacks. For example, if you choose to use the brute-force attack, you can specify the password length, use a template, and choose which characters you want to include in the attack. You can manually add characters as well.
In my testing, I encrypted a PDF file using Mac OS X's built-in PDF encryption tool. I used "dada123" as my password. The estimate time for completion was of "more than a day". I let it work for 15 minutes and nothing happened. The speed at which the app can work depends on your hardware, so the better the computer, the faster it will go.
The demo version will let you find passwords, but it will only show the first few characters of it.
Pros
- Very customizable
- Two different modes
Cons
- None