Malicious PDF — malware analysis report

Static analysis result for SHA-256 207387a5d9efe329…

MALICIOUS

PDF

1.16 MB Created: 2009-12-17 02:25:45 +08:00
MD5: 3848a34bb62bfffaaf31d1812bee58eb SHA-1: fd27163234274e32a526d10716dc7248eef44e4d SHA-256: 207387a5d9efe329f25473c4fdbe27855164a261d4a52afdaa2c293b6c3141a8
166 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation. A critical heuristic firing for CVE-2009-4324 (media.newPlayer) suggests exploitation of this vulnerability. The JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common attack pattern for this type of exploit.

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)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off000009f5.js
3a24e5afb870540b5c79fa30de554d843ae6b6d7ca54f2d0f972aa1eab69f638		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9F5 2496 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0020_00.bin
defa5d1fbde43e3e5af341d83f04286b6b1132f89222a3a288927684d318cde8		 pdf-objstm-decoded PDF /ObjStm 20 0 obj (inflated) 586 bytes

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