Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a5c186e6ada8ec…

MALICIOUS

PDF

40.0 KB
MD5: 5b96cdceb9eacb67a285508855e1a8fe SHA-1: 1ab0ad8129cc21a353af626068caf85ae2d89ccb SHA-256: 45a5c186e6ada8ec58e7ba5f3149d5a8c7f1a2633277bc7bb46b064a2295a620
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a known vulnerability (CVE-2009-4324) related to media player aliases. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is deobfuscated and likely responsible for downloading and executing a secondary payload, as indicated by ClamAV detections of Win.Trojan.Agent-36169 on the main file and an extracted artifact. The document body contains obfuscated JavaScript code, further supporting the malicious intent.

Heuristics 6

  • 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. (identified after JavaScript deobfuscation)
  • ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
b93677ca4b5baaa9ab3a24e6de6b820cd962a66c7fceb73e7ae11758f58acb6f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
dd93350d7e7d17f9d32b4dbab484694241353a254b3d770d956c991f0e1733f8		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2540 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414		 deobfuscated-js cross-stage annotation API aliases at offset 0x1E7 81 bytes

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