Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6325e4388671ea…

MALICIOUS

PDF

20.8 KB
MD5: 900f08652a5c0dd86dfc36fd0ff754c1 SHA-1: cf7c78397dda6948cdb1adfe28a886df1a1faa35 SHA-256: fe6325e4388671ea35db139e33afad03234d70b3dbed08ea6de34e33d843afca
198 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript and exploits CVE-2009-4324 via the media.newPlayer API. ClamAV detections (Win.Trojan.Agent-36170) on the main file and an extracted artifact confirm its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection on the extracted artifact named 'legacy_pdfkit_stage_000.js'.

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
d213800476e94de2ab151e76c9507f7c85e65c5cd9d056ce2cfc2d31499ac70d		 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
77318c8012beca13541181e25bc7ce4e164e60b3a75af0f353789a502b8d3ead		 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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