Malicious PDF — malware analysis report

Static analysis result for SHA-256 b137228885542d0c…

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: 8e34e0bba3c33a6e1426f15c0c98856d SHA-1: 2c59aa11c06a7ea2479e01dc6fdbf9ed5739db06 SHA-256: b137228885542d0cc80ed067ba75517f085aa1baaf3d81a6efa619b740bab4c9
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation, and the POLYGLOT_CHILD_PDF_STATIC_TRIAGE finding confirms a secondary embedded PDF with suspicious static findings. This secondary PDF likely contains the malicious JavaScript, which is designed to download and execute a further stage payload. The extracted artifacts 'javascript_obj0031_000.js' and 'polyglot_child_pdf_off0001d2f0.pdf' are key indicators of this multi-stage attack.

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_off0001d2f0.pdf
f0c2ae55fe664add1013fec4b222d87606be56af8042be06b95c6cdbeb92d2d2		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1D2F0 14030 bytes

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