Launch4j Unpacker

l4j_unpacker.py

import pefile
import sys

def main(argv):
	try:
		fileNameInput = argv
		print "Parsing file : " + argv
		FileHandle = open(fileNameInput,"rb")
		inputStream = FileHandle.read()
		peHandle = pefile.PE(fileNameInput) 
		overlayOffset = peHandle.get_overlay_data_start_offset()
		if(overlayOffset):
			print "Found overlay Data at offset " + hex(overlayOffset) + ", extracting..."
			fileOutput = open(fileNameInput+"-extracted.jar", "wb")
			fileOutput.write(inputStream[overlayOffset:])
			peHandle.close()
			fileOutput.close()
			FileHandle.close()
			print "file saved to " + fileNameInput + "-extracted.jar"
	except:
		print "Error: %s" % sys.exc_info()[0]
		print "Could not extract embeded JAR file. Existing..."

if __name__=="__main__":
	main(sys.argv[1])