Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43db7fa1ffe0158…

MALICIOUS

PDF

20.8 KB
MD5: 7ffe584d79082ff8c25bb9caee450985 SHA-1: 54a6d63ae4140c0578e5d310fe03ff406e83a748 SHA-256: c43db7fa1ffe015814045af3646252aa0164de7ba6e3b9a0c43133817dd5b3be
198 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2009-4324 (media.newPlayer vulnerability). The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, is obfuscated but appears to be designed to download and execute a second-stage payload. ClamAV detections further confirm the malicious nature of the file and its extracted artifacts.

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
c1c5446ea74536f5aa16d2f23796faf704733b754d1cfac1c3864ab9bad0c09a		 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
c2a1dcf21f26daa1d838f6892d1edeb089e4639e09fad16c0d2eb5a074ceb4a4		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x912 1244 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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