Javascript+deobfuscator+and+unpacker+portable | Instant Download |

While deobfuscators handle logic, unpackers handle encoding layers.

P42 is a sophisticated JavaScript deobfuscator that uses abstract syntax tree (AST) manipulation. You don't need Python installed; use the portable Python runtime (python-embedded.zip) extracted into the same folder.

JSDeob-Port’s portable sandbox is ≈3× faster than headless browser-based tools due to no DOM rendering overhead. javascript+deobfuscator+and+unpacker+portable

For nested eval or Function constructors, static analysis is insufficient. A lightweight JS sandbox is implemented using either:

The sandbox intercepts:

class PortableSandbox {
  constructor(code, timeoutMs = 1000) 
    this.code = code;
    this.timeout = timeoutMs;
run() {
    const captured = [];
    const safeGlobal = new Proxy({}, {
      get(target, prop) {
        if (prop === 'eval') return (c) => captured.push(c);
        if (prop === 'Function') return (...args) => captured.push(args.pop());
        return () => {};
      }
    });
    // Execute with restricted globals
    const fn = new Function('window', 'self', 'global', this.code);
    try  fn(safeGlobal, safeGlobal, safeGlobal);  catch(e) {}
    return captured;
  }
}

After unpacking, the AST is normalized:

We collected 1,500 obfuscated JavaScript samples from: The sandbox intercepts:

Ground truth was obtained via manual deobfuscation or original source (when available).