PDFのパスワードを総当たりで解析する

qpdf --password=xxxxxxxx --decrypt input.pdf output.pdf

pip install pikepdf tqdm

import pikepdf
from tqdm import tqdm
import os

passwords = []  # パスワードの候補を入れる

file_name = "xxxxxxxxxxxx.pdf"

for password in tqdm(passwords, "Decrypting PDF"):
    try:
        with pikepdf.open(file_name, password=password) as pdf:
            print("[+] Password found:", password)

            new_pdf = pikepdf.Pdf.new()
            new_pdf.pages.extend(pdf.pages)
            new_pdf.save(f"{os.path.splitext(file_name)[0]}_decrypted.pdf")

            break
    except pikepdf._qpdf.PasswordError as e:
        continue