This program uses a simple brute force attack to crack pdf files password. You can run it simply using windows executable or run the pure python script. This program is open to use anyone and any modifications are accepted. There are some external modules used to write this program. You can see them on the script file. here I included a sample pdf. Try 4,5 length and custom character list as 0123 you can get its password within 1 minute. also if you have a powerful computer, you can try this with multithread mode. Thank you. have a nice day!