Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d14f4f67700ef8…

MALICIOUS

PDF

4.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: 92606bb64a040c5e34b103218c5da7cd SHA-1: 98b76f9478574f4430660ddfec068f961310af4a SHA-256: d8d14f4f67700ef85197597d52fba7ba217ea2ba16d280becacb2be949f9379e
338 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript that is triggered by the OpenAction. Critical heuristics indicate exploitation of CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf), which are known vulnerabilities used to execute arbitrary code. The embedded JavaScript stream, named 'javascript_obj0013_001.js', is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection of 'Win.Trojan.Agent-36168'.

Heuristics 9

  • 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)
  • 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: Win.Trojan.Agent-36168 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36168
  • 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
2cfef7e6622f68624c219f6b15d36a5fa9e38f1c0ab968585af46b233437a078		 pdf-javascript-stream PDF /JS object 13 at offset 0x3FD 12516 bytes
Detection
ClamAV: Win.Trojan.Agent-36168
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).

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