added pdf cracker tutorial

Author: x4nth055

README.md

@@ -26,6 +26,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Brute Force FTP Servers in Python](https://www.thepythoncode.com/article/brute-force-attack-ftp-servers-using-ftplib-in-python). ([code](ethical-hacking/ftp-cracker))
     - [How to Extract Image Metadata in Python](https://www.thepythoncode.com/article/extracting-image-metadata-in-python). ([code](ethical-hacking/image-metadata-extractor))
     - [How to Crack Zip File Passwords in Python](https://www.thepythoncode.com/article/crack-zip-file-password-in-python). ([code](ethical-hacking/zipfile-cracker))
+    - [How to Crack PDF Files in Python](https://www.thepythoncode.com/article/crack-pdf-file-password-in-python). ([code](ethical-hacking/pdf-cracker))
 
 - ### [Machine Learning](https://www.thepythoncode.com/topic/machine-learning)
     - ### [Natural Language Processing](https://www.thepythoncode.com/topic/nlp)

ethical-hacking/pdf-cracker/README.md

@@ -0,0 +1,4 @@
+# [How to Crack PDF Files in Python](https://www.thepythoncode.com/article/crack-pdf-file-password-in-python)
+To run this:
+- `pip3 install -r requirements.txt`
+- Use any `wordlist.txt` you want, and run `pdf_cracker.py`

ethical-hacking/pdf-cracker/foo-protected.pdf

@@ -0,0 +1,17 @@
+import pikepdf
+from tqdm import tqdm
+
+# load password list
+passwords = [ line.strip() for line in open("wordlist.txt") ]
+
+# iterate over passwords
+for password in tqdm(passwords, "Decrypting PDF"):
+    try:
+        # open PDF file
+        with pikepdf.open("foo-protected.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

ethical-hacking/pdf-cracker/foo.pdf

@@ -0,0 +1,2 @@
+pikepdf
+tqdm