Made some simple edits to the python script that detects pixelknot, to make it easier to check many files at once. Run it in a directory of images. It will check all jpg and jpeg files in the directory and print out the filenames that have pixelknot header matches.

#!/usr/bin/pythonimport sys,getopt,globjpglist = glob.glob('.jpg')jpeglist = glob.glob('.jpeg')fulllist = set(jpglist + jpeglist)for each in fulllist: with open(each,"rb") as f: block = f.read(6) str = "" for ch in block: str += hex(ord(ch))+" " if str == '0xff 0xd8 0xff 0xdb 0x0 0x84 ': print each