Study the following log extract and identify the attack.

A Hexcode Attack uses standard percent-encoded hex values (like %2e%2e%2f) for directory traversal, not Unicode multi-byte encoding sequences.

Cross Site Scripting (XSS) involves injecting malicious client-side scripts into web pages viewed by other users, not path manipulation via encoded directory sequences.

Multiple Domain Traversal Attack is not a recognized standard attack category; the specific technique shown involves Unicode encoding to traverse server directories.

A Unicode Directory Traversal Attack uses Unicode or multi-byte UTF-8 encoded representations of the '../' sequence (such as %c0%af or %c1%9c) to evade input validation filters that only check for literal dot-dot-slash patterns. Web servers that decode Unicode after performing security checks are vulnerable to this technique, allowing attackers to traverse outside the web root and access restricted files on the server.