open pdf encrypted with SSN

pip3 install fitz
pip3 install PyMuPDF


# Contents of the tool crack.py
import fitz
import time
import sys
if len(sys.argv) != 2:
    print("Pass file encrypted with SSN as a single argument")
    sys.exit(1)
filename = sys.argv[1]
pdf = fitz.open(filename)
t = time.time()
for i in range(1000000000, 9999999999):
    if pdf.authenticate(str(i)):
        pdf.save("./decrypted.pdf")
        print("Your SSN used as password is: %s" % i)
	print("PDF file without password is: decrypted.pdf")
        break
print(time.time() - t)


# Running the script; SSN password is printed, decrypted file is saved as decrypted.pdf
python3 crack.py encrypted.pdf