Malicious PDF — malware analysis report

Static analysis result for SHA-256 431b29a8e5fa8f15…

MALICIOUS

PDF

43.2 KB
MD5: 8c9f95a038f8427ff13ff48a06d6b143 SHA-1: 8ad0f3186e7c73d11134c5dd3fca988bfe95bd28 SHA-256: 431b29a8e5fa8f15a4ce79a7d2251fe63489297b0fbb30166d1bc70a33e4dade
78 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2009-4324 vulnerability related to media.newPlayer, which is likely leveraged by the embedded JavaScript. The JavaScript's intent appears to be the execution of a second-stage payload, as suggested by the obfuscated nature and the presence of extracted JS files. The reconstructed JavaScript string "app[\'vie\' + \'werTy\' + app.doc.URL[3] + \'e\'][1]" is a strong indicator of exploit execution.

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
4f2ec4557863d3008e60a5b4bb104aeb69209efd6301847091792a865098490f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2221 bytes
legacy_pdfkit_stage_000.js
e25eb9dea927fc4a67324232040e7bccd1874be12a367fce24d0ca6ae7a3286e		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xAC8 2744 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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