Obfuscates content to bypass WAF signature. Note: May alter final file bytes if not reversable on server.
Encrypts each chunk with XOR. Note: May alter final file bytes if not reversable on server.
Add GIF Header (Polyglot)
Prepends 'GIF89a;' to make the file appear as an image. This MODIFIES the file's starting bytes.
Uploads a small, obfuscated PHP script that drops the full shell and self-destructs.