Malicious PDF — malware analysis report

Static analysis result for SHA-256 defc33b844a77283…

MALICIOUS

PDF

21.1 KB
MD5: 934428bf956cec133ab5487669bfd61f SHA-1: 9eeb308e0d7a195397dd8e2aa04a76c14be1206f SHA-256: defc33b844a772832a1d3d0f028d101985eda00aa6594e26be777aca67726545
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2009-4324 vulnerability, specifically related to the media.newPlayer function, which is used to launch embedded content. The extracted JavaScript, particularly 'legacy_pdfkit_stage_000.js', is likely responsible for exploiting this vulnerability to download and execute a secondary payload, as suggested by the ClamAV detection of 'Win.Trojan.Agent-36170' on the file and an extracted artifact. The document body contains obfuscated JavaScript-like code that further supports the execution of malicious scripts.

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-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
17ad4b11589cbf322681984f0b08bb8dafb2f48f075b6d96f67a1c35f656d6b1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1783 bytes
Detection
ClamAV: Win.Trojan.Agent-36170
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
74ec3cb337edf350b5765f62c42413691496f354b384663ed33c29ced9b105e0		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x912 1268 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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