Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b9699b9e1e7db5…

MALICIOUS

PDF

308.6 KB Created: 2009-12-21 16:55:35 +08:00 Authoring application: Acrobat PDFMaker 7.0ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿcer(Acrobat Distiller 7.0 (Windows) (via Acrobat Distiller 7.0 (Windows))
MD5: e27b421450267b30af1a5c678c33b766 SHA-1: dcf1bcd4111ba518b85c25bd27e141abeb4fab60 SHA-256: b0b9699b9e1e7db50f6937f650450289e5cacf7d9d9642fc9ce9045237f71ee2
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.001 PowerShell

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability via the media.newPlayer object. This JavaScript is responsible for loading and executing a secondary embedded PDF. The secondary PDF also contains suspicious JavaScript, indicating a multi-stage attack designed to deliver a malicious payload.

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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0043_000.js
8ce3a6480802617f09d669334e59524b35c689eab2505bd49c8e62d8a215ee84		 pdf-javascript-stream PDF /JS object 43 at offset 0x2430 2172 bytes
stream_009_off0004b716.js
72a7a81874bc825243697fb1380a9dc969da68bf826f90ff5241fdd360dd07a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B716 6463 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj0043_000_1.js
ca2fd006a36b1a8b13870873fa5709a4707a8a167d66ee7a20c04b335b1fa33e		 pdf-javascript-stream PDF /JS object 43 at offset 0x2430 2116 bytes
polyglot_child_pdf_off000492b1.pdf
9a92832b0e44cdf69122ca7d3818540f162a8455d855283afdd8545ffda376c3		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x492B1 16302 bytes

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