Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0739dd208c9d73…

MALICIOUS

PDF

58.6 KB Created: 2009-02-19 17:13:57 +08:00 Authoring application: WPS Office 2007 专业版 (via PDFlib 7.0.0 (C++/Win32))
MD5: 511625f5fa0315b5a870029ae3338464 SHA-1: 1e04d7e1614400dcaf7c72f7b33b059f4e81a34c SHA-256: 3c0739dd208c9d739d0f9f3c91149f5b74e670391fbe7529531792212e3354f1
276 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the `unescape()` function and triggers the CVE-2008-2992 vulnerability via `util.printf`. This indicates the file is designed to exploit this known PDF flaw. ClamAV detections confirm its malicious nature, identifying it as a dropper. The extracted JavaScript file, `javascript_obj0004_000.js`, is likely responsible for downloading and executing a second-stage payload.

Heuristics 8

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • ClamAV: Pdf.Dropper.Agent-7251696-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7251696-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact high 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0004_000.js
19205f361e232a361b1857cecb80d1b9e4ec36f3d39beae2d6a56f6b73e8d161		 pdf-javascript-stream PDF /JS object 4 at offset 0xAE6D 55272 bytes
Detection
ClamAV: Win.Trojan.Agent-36168
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
font_00_sfnt_off00002299.bin
89b8730c494861f1fa46a7ee92670c41b683cf4d5c3ff1c383ef3b4b61a4934d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2299 51180 bytes

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