Malicious PDF — malware analysis report

Heuristics 6

• Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
  Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
• Unusually high stream count medium PDF_MANY_STREAMS
  PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
• Fake invoice / payment lure low SE_INVOICE_LURE
  Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
• Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
  The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
• Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
  One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL http://www.w3.org/1999/02/22-rdf-syntax-ns#

  • http://purl.org/dc/elements/1.1/
  • http://ns.adobe.com/xap/1.0/
  • http://ns.adobe.com/pdf/1.3/
  • http://ns.adobe.com/xap/1.0/mm/
  • http://en.wikipedia.org/wiki/MIT_License
  • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
  • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
  • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
  • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
  • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
  • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
  • http://www.microsoft.com/Typography/0

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