Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cb4ee2ed659c1e…

MALICIOUS

PDF

7.4 KB First seen: 2026-05-08
MD5: 4f86ecb3e07f1eb2c7d416d45f3246b8 SHA-1: 287137c0a2a8ac8521035deb9438ebe6826be857 SHA-256: b2cb4ee2ed659c1e3348e76094e274fa56937d3867e31ffa9ba5b74b2adf0476
128 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains an embedded Flash file (Tatsumaki.swf) and triggers a RichMedia heuristic, indicating it likely exploits a Flash vulnerability for code execution. The ML classifier strongly flagged this PDF as malicious. While the specific exploit is not detailed, the presence of an embedded executable artifact points to a client-side execution attack, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Suspicious extracted artifact high 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Tatsumaki.swf pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x3C0 4802 bytes
SHA-256: 3b8d854f7307db23e121a9655c37e90546097430a894e44fabb8496512f1d042
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=SWF; declared_or_context_type=PDF; filename=Tatsumaki.swf; kind=pdf-embedded-file Carved SWF contains ByteArray/Loader/loadBytes staging terms. Carved artifact entropy is 7.94, consistent with packed or encrypted content.

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