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Inspecting the front-end JavaScript source code reveals a listener processing the form submission: javascript

Each section is broken into , making it easy to follow without blindly copy-pasting. The author also adds “Why this works” callouts — for example, explaining how exiftool can embed malicious JavaScript into PDF metadata that gets executed by the server’s PDF parser. pdfy htb writeup upd

If the remote target is behaving unexpectedly, try running wkhtmltopdf locally with various inputs to understand how it handles redirects and local file protocols. Inspecting the front-end JavaScript source code reveals a

[ HTB Target Server ] ---> Requests ---> [ Attacker VPS Web Server ] | Executes Redirect | [ HTB Target Server ] <--- Follows File URI <-------+ (Reads Internal Files) pdfy htb writeup upd

No bloated scripts — every tool serves a clear purpose.