Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e5548207caf170…

MALICIOUS

PDF

1.4 KB
MD5: 1010e5b8d67eb034371fc4c461dc5344 SHA-1: 3b10915b9dde1cd8dc225f069fe9c917bd952fd3 SHA-256: a5e5548207caf17086fe965f9bc4fe023a212674b6843de37ddcae9258ff74e8
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious File T1071.001 Web Protocols: Web Protocols

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 used to exploit this flaw. The embedded JavaScript likely serves to download and execute a second-stage payload, as suggested by the ClamAV detection of Pdf.Dropper.Agent-1828886. No specific family could be identified, but the dropper functionality is clear.

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. (matched in decompressed stream)
  • ClamAV: Pdf.Dropper.Agent-1828886 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828886
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js
6de2830260cb2cb4b55b8f0f0c31dba755ba8f7d56e6f7bb6539f3ffe3f9b4f9		 pdf-javascript-stream PDF /JS object 111111 at offset 0x160 1277 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj111112_001.js
8aa490887d1b90f5d0cfc1a8b5388f0222f8328761acc8e0048ae7221c3a3f4f		 pdf-javascript-stream PDF /JS object 111112 at offset 0x48E 281 bytes

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