Malicious PDF — malware analysis report

Static analysis result for SHA-256 92101778c0a11f88…

MALICIOUS

PDF

25.1 KB
MD5: b6b540f250fe046047c5a165940f9e5f SHA-1: 3fe9bec95bb775d4aa2874708a63f42f112c6571 SHA-256: 92101778c0a11f880c247703d663ee7fed790a579907ecfe7b1555aeb20c9b66
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability via the util.printf function. This script is designed to download and execute a second-stage payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36170' on both the initial PDF and an extracted artifact. The deobfuscated JavaScript stream is the primary mechanism for this malicious activity.

Heuristics 6

  • 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. (identified after JavaScript deobfuscation)
  • ClamAV: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36170
  • 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
ed5c7612d80bad9ab946dbb08a7465ef0eb14b852a3d99cdbce3d34e48d51b8f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1667 bytes
Detection
ClamAV: Win.Trojan.Agent-36170
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
bafdfe3e29801644a3418f0a124f1b74f09064eab6d1a804fe4ea681b1a96467		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x89E 1547 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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