Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7cd52e9d3af8fc…

MALICIOUS

PDF

7.3 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: 58067191889c8e3274ff0a91d8bba030 SHA-1: 18c595eb2281ab5b17cb2e85035a1eba8e45e5a3 SHA-256: 8f7cd52e9d3af8fca826f1dea51ac6892f7803f85b663def0b7574a04b85d220
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Shell Scripting: JavaScript

The PDF file contains embedded JavaScript with multiple eval() calls, indicating obfuscation and likely malicious code execution. ClamAV signatures confirm this, identifying it as 'Pdf.Exploit.Agent-35587'. The script's purpose is to download and execute a second-stage payload, as suggested by the heuristic firings and the ClamAV detection. The obfuscated JavaScript is reconstructed to 'New_Script Rtqtn6Sj8 '@' eval('Ng4aruYGOGGDzs=Ma'+'th.'+'ce'+'il(suTxrtGpqeA'+'/yOUi1oib39Us2I eval('K26phzIfr=M'+'ath'+'.m'+'in(suTxrtGpqeA,'+'yOUi1oib39Us2I 'TWMuf21IiBl7|'+'=(sAPU09VjjQ['+'Rtqtn6Sj8.'+'cha'+'rCo'+'de'+'At(ABSOBl43xzj+'+'+ zau8rJO8WO 'hM90f7+'+'=S'+'tri'+'ng['+'"fro'+'mCha'+'rCod'+'e"](5^'+'TWMuf21IiBl7&'+'25'+'5 hM90f7 datfield Scribus 1.3.3.12 Scribus PDF Library 1.3.3.12 2008312053854 2008312053854'.

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
e706d696b386afa0e5e2a6c01e9815a95131b3fcc8424ab59153628dc43ea5e8		 pdf-javascript-stream PDF /JS object 13 at offset 0x38E 5991 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35587
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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