Malicious PDF — malware analysis report

Static analysis result for SHA-256 928820cd1f067bd3…

MALICIOUS

PDF

171.8 KB Created: 2009-12-21 16:55:35 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: ae150e81b99637e0d19ff8bf077eb55c SHA-1: ed4839be0c6f879b2b2d355372d8102e90e40c82 SHA-256: 928820cd1f067bd35986baec78ec8bdf593e05b194e3fed6b442e94e26ff8a00
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript and exploits CVE-2009-4324, indicated by the 'media.newPlayer' heuristic. The presence of a secondary embedded PDF with similar suspicious findings further supports its malicious nature. The primary function appears to be the execution of JavaScript, likely to download and execute a second-stage payload, as suggested by the 'Pdf.Exploit.Agent-23134' ClamAV detection.

Heuristics 8

  • 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.
  • ClamAV: Pdf.Exploit.Agent-23134 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-23134
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0043_000.js
72a7a81874bc825243697fb1380a9dc969da68bf826f90ff5241fdd360dd07a9		 pdf-javascript-stream PDF /JS object 43 at offset 0x2430 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).
polyglot_child_pdf_off00026f69.pdf
dc22600c06981765124bf5d033f8615140d1f036a7e12f6f89ceae2c45d75299		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x26F69 16302 bytes

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