Malicious PDF — malware analysis report

Heuristics 13

• PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
  PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
• Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
  A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
• ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
• ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
  ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
• unescape() call high PDF_UNESCAPE
  unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
• ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
  Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
• JavaScript action low PDF_JAVASCRIPT
  PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
• Embedded JS stream low PDF_JS
  PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
• XFA form low PDF_XFA
  PDF uses XML Forms Architecture — can contain script logic
• AcroForm button with action trigger low PDF_ACROFORM_BUTTON
  PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
• 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.bitstream.com

  • http://www.w3.org/1999/02/22-rdf-syntax-ns#
  • http://ns.adobe.com/xap/1.0/
  • http://ns.adobe.com/pdf/1.3/
  • http://ns.adobe.com/xap/1.0/mm/
  • http://purl.org/dc/elements/1.1/
  • http://ns.adobe.com/xfa/promoted-desc/
  • http://ns.adobe.com/xdp/
  • http://www.xfa.org/schema/xci/2.6/
  • http://www.xfa.org/schema/xfa-template/2.6/
  • http://www.xfa.org/schema/xfa-locale-set/2.7/
  • http://www.xfa.org/schema/xfa-locale-set/2.6/
  • http://www.xfa.org/schema/xfa-form/2.8/
  • http://www.xfa.org/schema/xfa-data/1.0/

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