Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a826bbe1d65a1c…

MALICIOUS

PDF

42.9 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: a945cb979d35f8bdcdc8a044c06efd92 SHA-1: f7630b46c4394ee44166bdea60f246f9aebcd454 SHA-256: 28a826bbe1d65a1c6a743cc09cb347e0624677a8d5636b691298494ef7402013
196 Risk Score

Malware Insights

This PDF file exploits CVE-2009-4324 via embedded JavaScript. The primary JavaScript stream is obfuscated using unescape() and string concatenation, but analysis reveals it attempts to load and execute a secondary PDF payload. This secondary PDF also contains suspicious findings, indicating a multi-stage attack. The overall goal is likely to deliver a malicious payload through a known PDF vulnerability.

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. (identified after JavaScript deobfuscation)
  • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
cab30518bf4d3aae645cf991b90a1dfa3d561612262352a25a59ad949d3f9838		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
polyglot_child_pdf_off000064fa.pdf
6d3f3366594eca7d35c1950c1a251680b1accaa18889b7893b745df6c91c8bff		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x64FA 18037 bytes
polyglot_child_pdf_off0000936e.pdf
4b903b953f0dec34db283892d9d778bd0bef3e1de524804bc3d410b24d44d230		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x936E 6145 bytes

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