Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a8e7578111858f…

MALICIOUS

PDF

46.2 KB
MD5: 85f98c6b37390b861b1c8d77bbbd6d5f SHA-1: fb0ade8e7d1f29b4a1e6408feb72c51501406e9c SHA-256: 39a8e7578111858f2a6936888674e367de3bcf4aab53c1eb3309142b0f5a0890
78 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a known vulnerability, CVE-2009-4324 (media.newPlayer). 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. The heuristics indicate a critical vulnerability exploit, supporting the attack pattern of leveraging a PDF exploit to deliver further malicious content.

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
e165e3168364bb8a874f596df63e07fb14981a2077f15cab239ac80f6c7e033f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
legacy_pdfkit_stage_000.js
d7155f873b59e589a73c704be477a30cf4921d43cb2c81abc4b0960cad6f3280		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xC2D 1220 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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