How to deobfuscate javascript file, i have a javascript code are deobfuscate .

Code: http://pastebin.com/zFH2GidN Help me and thanks you.


1 Answer 1



Based on @ws's comment and @nderscore's code, use this JSFiddle to decode the thing.

To find the password that this script asks for, you can use a simple debugging trick.

  • Go to JSFuck and uncheck the Eval Source option.
  • Paste the obfuscated JavaScript
  • Run

You'll see:

enter image description here

It seems to be calling prompt(), so put a breakpoint on it, like this:

(I'll be using Chrome for this)

  • Open console (F12)
  • Backup the original prompt like this: window.prompt_ = window.prompt
  • Override the call to prompt with a breakpoint: window.prompt = function(a, b){ debugger; return window.prompt_(a, b); }
  • Click Run This
  • You'll break here:

enter image description here

  • Check the callstack at the right bottom.
  • Go back one function, and you'll see:

enter image description here


Password is forevermore:

enter image description here enter image description here

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