CrackPDF RAR Password Finder has three kinds of detecting ways for password, you can choose anyone according to your needs. And it is is free to download and evaluate.

Some features of RAR Password Finder:
1.Support Windows 2000 and later systems of both 32bit and 64bit.
2.Support three kinds of finding types: Brute-force with Mask Attack (Trying all Possible Combinations), Brute-force with Mask Attack, Dictionary Attack (Recommended).
3.Enable to auto-save the current recovery state every 15 minutes by default. You can also customize the time.
4.Support to shut down the computer after the cracking finishes.
5.Support to set the RAR password length and character in Brute-force with Mask Attack mode.
6.Save the current the finding status in case of abrupt stop.