Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afeae8146e320ac…

MALICIOUS

PDF

425.7 KB Created: 2009-12-16 21:50:36 +08:00 Authoring application: PDF Editor - Foxit Software
MD5: b4b21760df5d0bd0013480b564a30870 SHA-1: b553ecaedc6ef5d18f911e7abc9ad646eda35d2a SHA-256: 9afeae8146e320acca11b38e4dfc40c407364c7a4093798efd8f99b4ce61a163
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL

The PDF file contains embedded JavaScript, including a stream utilizing String.fromCharCode, which is a common obfuscation technique. The critical heuristic firing for CVE-2009-4324 (media.newPlayer) indicates exploitation of this vulnerability. The embedded JavaScript likely facilitates the download and execution of a secondary payload, as suggested by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic indicating a long encoded blob and script obfuscation. The PDF itself is image-only, a common lure tactic.

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)
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
97e6c8fb70f6fedab160a41095c99dce3c9d53a0086d3a8d4e6d47cbe03dce61		 pdf-javascript-stream PDF /JS object 17 at offset 0x457 1946 bytes
javascript_obj0019_001.js
f8fa5090f403a23bc5ee29904e8cdf5a66288cdd6b424e7c64f611e32364ce3c		 pdf-javascript-stream PDF /JS object 19 at offset 0xCA7 2682 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).

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