Malicious PDF — malware analysis report

Static analysis result for SHA-256 568545aee827214d…

MALICIOUS

PDF

99.0 KB
MD5: b46ddcbceb021aaea4bbb6d4e2acff4d SHA-1: ab5fe5981b169da96cd5e91d1a581280f7698931 SHA-256: 568545aee827214d230aa0b37bb99385d46719f8d35a1d724e6baf7405e615f4
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript and triggers a known vulnerability (CVE-2009-4324) related to media player annotations. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but appears to be designed to download and execute a secondary payload. ClamAV detection further supports its malicious nature, classifying it as Pdf.Dropper.Agent-7213135-0.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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: Pdf.Dropper.Agent-7213135-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7213135-0
  • 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
aa9553c5c136a401ec1cb044ddf365fe99990a7442a144a132473c51597005a2		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
legacy_pdfkit_stage_000.js
a2ba9391954c732c136fbaaf81c34803561304c0ecefc190ed17e8ae28614b2c		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xC2D 2720 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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