Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c048339dce9fa9c…

MALICIOUS

PDF

21.1 KB
MD5: 76b24e8b45c79d2a22ccf05cd50923dc SHA-1: ce765457c054e1633c4789467f72e973bdd02633 SHA-256: 7c048339dce9fa9ca037efe3ed86e2f12440f03f384b5ab48dd5f96784f3696e
198 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, suggesting the JavaScript is designed to exploit this flaw. ClamAV detections on both the primary PDF and an extracted artifact ('Win.Trojan.Agent-36170') confirm malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload, as suggested by the 'legacy_pdfkit_stage_000.js' file and the general nature of PDF exploits.

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
214df318b53e8c9aebbc1df83c0a1d508cc9953c0e4de4bd18e77fac39d3af51		 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
74ec3cb337edf350b5765f62c42413691496f354b384663ed33c29ced9b105e0		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x912 1268 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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