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59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
#
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# simple unpacker/deobfuscator for scripts messed up with
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# javascriptobfuscator.com
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#
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# written by Einar Lielmanis <einar@jsbeautifier.org>
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# rewritten in Python by Stefano Sanfilippo <a.little.coder@gmail.com>
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#
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# Will always return valid javascript: if `detect()` is false, `code` is
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# returned, unmodified.
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#
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# usage:
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#
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# if javascriptobfuscator.detect(some_string):
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# some_string = javascriptobfuscator.unpack(some_string)
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#
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"""deobfuscator for scripts messed up with JavascriptObfuscator.com"""
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import re
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PRIORITY = 1
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def smartsplit(code):
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"""Split `code` at " symbol, only if it is not escaped."""
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strings = []
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pos = 0
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while pos < len(code):
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if code[pos] == '"':
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word = '' # new word
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pos += 1
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while pos < len(code):
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if code[pos] == '"':
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break
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if code[pos] == '\\':
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word += '\\'
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pos += 1
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word += code[pos]
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pos += 1
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strings.append('"%s"' % word)
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pos += 1
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return strings
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def detect(code):
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"""Detects if `code` is JavascriptObfuscator.com packed."""
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# prefer `is not` idiom, so that a true boolean is returned
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return (re.search(r'^var _0x[a-f0-9]+ ?\= ?\[', code) is not None)
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def unpack(code):
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"""Unpacks JavascriptObfuscator.com packed code."""
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if detect(code):
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matches = re.search(r'var (_0x[a-f\d]+) ?\= ?\[(.*?)\];', code)
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if matches:
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variable = matches.group(1)
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dictionary = smartsplit(matches.group(2))
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code = code[len(matches.group(0)):]
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for key, value in enumerate(dictionary):
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code = code.replace(r'%s[%s]' % (variable, key), value)
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return code
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