Decompiling obfuscated java bytecode

java jvm bytecode proguard decompiler
JoaoHornburg picture JoaoHornburg · Jun 22, 2011 · Viewed 9.1k times · Source

I work on a platform which runs Java apps. Those apps are often obfuscated, most of them using ProGuard, which makes debugging issues with our platform very difficult.

Currently I'm using JD (http://java.decompiler.free.fr/ ) to decompile it those apps. JD does a decent job, but sometimes the generated code is too difficult to understand.

This appears to happen mainly because obfuscation tools exploit the less constrained spec of JVM Bytecode to produce valid bytecode which doesn't map back to valid Java code (example: aggressive overloading).

So, my question is: is there a decompiler built especially to deal with obfuscated bytecode?

Answer

Eugene Kuleshov picture Eugene Kuleshov · Jun 22, 2011

I doubt any decompilers do that. However you could implement custom bytecode transformation and rename overloaded method and variable names using something like ASM.

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