Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16e2f9fb42d58ff…

MALICIOUS

PDF

2.8 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: ead3d040d65ec6cda2d0de69d6582eb7 SHA-1: 045a1e122213a10f6fa9451cf4f51d7d14835a76 SHA-256: d16e2f9fb42d58fff4d41ba1f7bd516d536725470f3a27243c28eb10a4f9ce4a
278 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is triggered by the OpenAction. The script utilizes the unescape function and exploits CVE-2007-5659 (Collab.collectEmailInfo) to execute arbitrary code. ClamAV detected this file as Win.Trojan.Agent-34667, indicating it likely downloads and executes a second-stage payload. The extracted artifact javascript_obj0013_001.js further supports the presence of malicious JavaScript.

Heuristics 8

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • ClamAV: Win.Trojan.Agent-34667 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-34667
  • 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.
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
6c7c2b98e0aceb30f28f46a73cd5f51611113ab718bcbc024e570f29bdbdcdc2		 pdf-javascript-stream PDF /JS object 13 at offset 0x36C 2688 bytes
Detection
ClamAV: Win.Trojan.Agent-34667
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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