Malicious PDF — malware analysis report

Static analysis result for SHA-256 d054f3b69b1eb6ad…

MALICIOUS

PDF

21.4 KB
MD5: ea727d09ed52dd01f4ac1acecd7c6609 SHA-1: a07c3ea9b3360d6786745fa38e19282163d9d5af SHA-256: d054f3b69b1eb6ad7e3822689b3e20e4c1515af171bae1353f6a30267aad66e3
108 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a known vulnerability, CVE-2009-4324, related to the media.newPlayer API. The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', appears to be designed to download and execute a second-stage payload, as suggested by the heuristic 'Script obfuscation indicators; files: legacy_pdfkit_stage_000.js'. The exact payload and download URL are not directly extractable from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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)
  • 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
68cc65945a52836e1c139eb6b6961ce36660c6443b0824cd52e2087d675494fc		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2221 bytes
legacy_pdfkit_stage_000.js
c3df0b6d669953258363ab802ac0d32c63d5685d76eb2e0ad1f70f86b924f691		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xAC8 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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