1. Go to @jonasl github and clone this repo. Can't paste the link, for some reason @twitter thinks it's malicious...
2. Copy Burp Collaborator URL to the clipboard.
3. Use as
4. Test file upload features with the generated PDFs.
5. PRO tip: On some endpoints, you need to provide base64 data.
You can use the search engine to find a PDF => Base64 converter. Use the base64 value in the input, usually via a POST request parameter.
6. Comment below if you know of other similar tools! Such as for images for example.