JavaScript obfuscation: From party trick to phishing kit

This article from Cisco Talos explores the techniques used to obfuscate JavaScript code, primarily for malicious purposes like phishing and malware delivery. The author details various methods of hiding code, including string manipulation, identifier renaming, runtime decoding, and control-flow flattening. They emphasize that obfuscation is not just about making code unreadable; it's a deliberate effort to mislead analysts and prevent reverse engineering. The article highlights tools like javascript-obfuscator that automate these techniques and provides practical advice on how to approach and analyze obfuscated JavaScript, focusing on identifying the underlying behavior rather than getting bogged down in the complexity of the obfuscation itself. It stresses the importance of using controlled environments and logging to avoid feeding sensitive material into AI tools.