Analyst is investigating proxy logs and found out that one of the internal user visited website storing suspicious java scripts. After opening one of them, he noticed that it is very hard to understan

Steganography hides data inside other media files such as images or audio, not within source code logic to confuse analysts.

Code encoding converts code to a specific format (such as Base64) but is a subset technique often used within obfuscation, not the overarching method described.

Obfuscation transforms code using techniques such as variable renaming, dead code insertion, control flow alteration, and string encoding to make the logic extremely difficult for analysts to follow. Unlike encryption, obfuscated code remains executable by the browser or runtime engine. This technique is widely used in malicious JavaScript to extend the time needed for analysis and evade signature-based detection.

Encryption renders data completely unreadable without a key, and encrypted code cannot be directly executed by a browser, making it impractical as the sole technique for deployed malicious scripts.