brute_force_pdf.py

# https://www.thepythoncode.com/article/crack-pdf-file-password-in-python

import pikepdf
from tqdm import tqdm

# load password list
passwords = []
for y in range(70, 99):
    for m in range(1, 12):
        for d in range(1, 31):
            passwords.append(str(y) + ('0' + str(m))[-2:] + ('0' + str(d))[-2:])

# iterate over passwords
for password in tqdm(passwords, "Decrypting PDF"):
    try:
        # open PDF file
        with pikepdf.open("../Downloads/1.pdf", password=password) as pdf:
            # Password decrypted successfully, break out of the loop
            print("[+] Password found:", password)
            break
    except pikepdf._qpdf.PasswordError as e:
        # wrong password, just continue in the loop
        continue