Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b97147c3d4db431…

MALICIOUS

PDF

100.3 KB
MD5: 60c2c2fd04cf5962fceb0addae989bf0 SHA-1: c5921e5bce581c70a93340e2f51bdb79f9f1f9f1 SHA-256: 4b97147c3d4db431c5ccf44b016c40bb493fbb85fee6896ed30ca90b5786a702
196 Risk Score

Malware Insights

The PDF file contains embedded JavaScript and exploits CVE-2009-4324 via the media.newPlayer object. A secondary embedded PDF was also found with similar suspicious static findings. The embedded JavaScript stream, named 'javascript_obj0218_000.js', is likely responsible for downloading and executing a second-stage payload, as indicated by the 'unescape()' call and the overall structure of the exploit.

Heuristics 7

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • 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)
  • Suspicious extracted artifact medium 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.
  • 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.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0218_000.js
2ea37075bcfffeee08b257caa647ed2996d82e790ee7460379210c7ab1a24cb2		 pdf-javascript-stream PDF /JS object 218 at offset 0x549A 2156 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off0001359e.pdf
f8de0549a028ad4fcdc04b93e6e8e447e8b344e8bc12c6c174dc66cb5593fc0d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1359E 23403 bytes

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