Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cc73eb90a0ab34…

MALICIOUS

PDF

21.2 KB
MD5: 5eaa3d4de15458a5ae90e6a96d91a9b9 SHA-1: c93a959d78b80e0640628ead852193b77a4128e1 SHA-256: 93cc73eb90a0ab3436f8ddf8f8ecd371742f7fa4605c7a1da331c2376ece2ae8
198 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability via the media.newPlayer API. The embedded JavaScript, specifically in 'legacy_pdfkit_stage_000.js', is designed to download and execute a secondary payload, as indicated by ClamAV detections of 'Win.Trojan.Agent-36169' on both the initial PDF and an extracted artifact. The obfuscated JavaScript and the use of a known exploit point towards a malicious downloader.

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
57dc0acc53a27983c0a42575ed7b5ac317bb2ef8569abbb77866a0920e44843d		 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
c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 1256 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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