Malicious RTF — malware analysis report

Heuristics 8

• Equation Editor ProgID + OLE object high CVE related RTF_EQUATION_EDITOR
  RTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
• CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
  RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
• Package object class high RTF_OBJCLASS_PACKAGE
  OLE Package object — can wrap arbitrary files
• Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
  RTF contains ~1133KB of hex-encoded data inside \objdata sections — may hide a payload
• OLE object data medium RTF_OBJDATA
  RTF contains 2 \objdata section(s) — embedded OLE objects
• Embedded OLE object medium RTF_OBJEMB
  RTF contains \objemb — embedded OLE object
• 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

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