Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c8e2e7323819f5…

MALICIOUS

PDF

130.4 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: de18fb5cf225cb4480859b0f5be82a1e SHA-1: 232eb93fb3591fa650ca206eb74ccc60e20bf993 SHA-256: 96c8e2e7323819f5742afce6cdaf75087305190cab13fc6cd0df9ea3455b140d
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file exhibits multiple high-severity heuristic firings related to embedded JavaScript and an ML classifier flagging it as malicious. A secondary embedded PDF was also found with suspicious static findings. The presence of obfuscated JavaScript, indicated by the `unescape()` call and the extracted `javascript_obj0031_000.js` file, strongly suggests the execution of malicious code. The likely intent is to download and execute a second-stage payload, as is common with such embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • 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_obj0031_000.js
d11df98c7ee948d719272ddf277381778834180ea847575920fd07d7f7341ca2		 pdf-javascript-stream PDF /JS object 31 at offset 0x20B6 3242 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s).
polyglot_child_pdf_off0001d2e8.pdf
60412d2e52e35bdd0a96ce08d0261041215024a3dbe517b4f52ba3dccea5ef48		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1D2E8 14030 bytes

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