signature-base/yara/gen_bad_pdf.yar

rule SUSP_Bad_PDF {
   meta:
      description = "Detects PDF that embeds code to steal NTLM hashes"
      author = "Florian Roth, Markus Neis"
      reference = "Internal Research"
      date = "2018-05-03"
      hash1 = "d8c502da8a2b8d1c67cb5d61428f273e989424f319cfe805541304bdb7b921a8"
   strings:
      $s1 = "         /F (http//" ascii
      $s2 = "        /F (\\\\\\\\" ascii
      $s3 = "<</F (\\\\" ascii
   condition:
      ( uint32(0) == 0x46445025 or uint32(0) == 0x4450250a ) and 1 of them
}