Malicious PDF — malware analysis report

Static analysis result for SHA-256 83711c4bfa0fc0e2…

MALICIOUS

PDF

1.4 KB
MD5: 9e6e307630175bb65839ebc2b3beb9a0 SHA-1: db211a36f50241012abf279f497315274063ab39 SHA-256: 83711c4bfa0fc0e26206ad02dc6b6485dbedcf1545b7f67f7c9fde89f42d3e6e
178 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2009_4324 heuristic suggests exploitation of a specific vulnerability related to media playback. The presence of unescaped JavaScript and a ClamAV detection for Pdf.Dropper.Agent-7278100-0 strongly suggests the script is designed to download and execute a secondary payload. No specific family could be identified.

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-7278100-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7278100-0
  • 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
b8f511d55e6e953df8e6fc9aef49eb01252833e458d758b660b6de977f307a5d		 pdf-javascript-stream PDF /JS object 111111 at offset 0x160 1295 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
345ff4023c85f17cbddebc98c3c5009d87b50b4cf0441e31fe4899a501582c53		 pdf-javascript-stream PDF /JS object 111112 at offset 0x494 272 bytes

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