Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e51f858ac674a…

MALICIOUS

PDF

21.3 KB
MD5: c9a1bdbfdf650a08d91a3fe76a56c904 SHA-1: 423b2303a7828e4e6b93752cf9fb803b7c3af100 SHA-256: f92e51f858ac674a4a0a29b1da940a7ec9dae7324b46c338fdd5c348a5134f3a
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic specifically points to a known exploit targeting Adobe Reader's media.newPlayer functionality. The embedded JavaScript, particularly the deobfuscated legacy_pdfkit_stage_000.js, likely facilitates the execution of this exploit to download and run a secondary payload, as suggested by the ClamAV detection of Win.Trojan.Agent-36169 on the main file and an extracted artifact.

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-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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
1a8aeb409ca6f9f7803cf88eeccfbaf8a9a6a3abfe0daa781f0f0b2d6d24f307		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
630bbd87d4c991442612bbfc5d0e64a58d98100212c3f8e897f80b45684ffd16		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 1262 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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