code: def is_android_raw(raw):
      
      val = None
  
      # We do not check for META-INF/MANIFEST.MF,
      # as you also want to analyze unsigned APKs...
      # AndroidManifest.xml should be in every APK.
      # classes.dex and resources.arsc are not required!
      # if raw[0:2] == b"PK" and b'META-INF/MANIFEST.MF' in raw:
      # TODO this check might be still invalid. A ZIP file with stored APK inside would match as well.
      # probably it would be better to rewrite this and add more sanity checks.
      if raw[0:2] == b"PK" and b'AndroidManifest.xml' in raw:
          val = "APK"
      elif raw[0:3] == b"dex":
          val = "DEX"
      elif raw[0:3] == b"dey":
          val = "DEY"
      elif raw[0:4] == b"\x03\x00\x08\x00" or raw[0:4] == b"\x00\x00\x08\x00":
          val = "AXML"
      elif raw[0:4] == b"\x02\x00\x0C\x00":
          val = "ARSC"
  
      return val
docs: Returns a string that describes the type of file, for common Android
      specific formats