Malicious PDF — malware analysis report

Static analysis result for SHA-256 8978a152ebf292de…

MALICIOUS

PDF

101.7 KB Created: 2009-07-23 08:47:32 UTC Authoring application: Acrobat Web Capture 6.0
MD5: e42f8e662d39a31b596d86504b9dc287 SHA-1: 97f685943fe61742fee3f87f468290c757d0bb7d SHA-256: 8978a152ebf292dea755309fd179e0d68df4c7fbcca796cc51dbf63a7da3e430
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream and a secondary embedded PDF were extracted, indicating a multi-stage attack. The primary intent appears to be the execution of a second-stage payload, likely facilitated by the embedded JavaScript and the obfuscated secondary PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
241720d05eb9f1399739386460cd49222f3f00f2fb3c825f619c05307ac296bd		 pdf-javascript-stream PDF /JS object 36 at offset 0x2A35 1803 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off0001679d.pdf
3d39e6230ca4ef29355964dd9cedafe554e0e406e9665a0525bf95626c359dbb		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1679D 12104 bytes

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