JavaScript Deobfuscation

[Nytro]

JavaScript Deobfuscation

A Manual Approach

Sudeep Singh

4/15/2012

Table of Contents
Preface .......................................................................................................................................................... 3
Reasons for JavaScript Obfuscation .............................................................................................................. 4
Javascript Minifiers vs Obfuscators ............................................................................................................... 4
Methods of JavaScript Obfuscation .............................................................................................................. 5
Basic JavaScript Obfuscation ......................................................................................................................... 6
Blackhole Exploit Kit .................................................................................................................................... 12
Breaking Point Obfuscated JS Challenge ..................................................................................................... 23
JS Obfuscation in MetaSploit Framework ................................................................................................... 34
Conclusion ................................................................................................................................................... 37
References .................................................................................................................................................. 37

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