Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3add59f9353fc2…

MALICIOUS

PDF

39.9 KB
MD5: f5689b0288bc4f3ca60ef8f2e941eb0d SHA-1: 0ccfc41e83b65c7b3c85763ec85cd44f6d1f5f2c SHA-256: 3d3add59f9353fc2bbade9bf01214e4162185102fccfef0081da98c1002ad30b
228 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability (media.newPlayer). Static analysis indicates the JavaScript is designed to download and execute a secondary payload, as suggested by the ML classifier and ClamAV detection (Win.Trojan.Agent-36169). The deobfuscated JavaScript and the 'legacy_pdfkit_stage_000.js' artifact further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
18a9755cbb1de843b515886f01eac1ef80a36ed2a1d13586d56e3d71c4f350e6		 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
4e225c059cd17abe33884c93d6a7bd250aa680bbb866e1b3f1f0fd18974150d6		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2534 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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