Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe38fb192c4ed2f3…

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: e2fa29f19db76c342f40e6da8c001a67 SHA-1: de82f1f04a97f56e96e1b19118eb23fbb2e8bfed SHA-256: fe38fb192c4ed2f3c4123494a28e206350ee9e513cbd240d0f0ee90ce7009640
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript with multiple eval() calls, indicating obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically an exploit. The JavaScript is heavily obfuscated, making it difficult to determine the exact payload, but the presence of eval() and embedded JS streams points to a common exploit delivery technique. The reconstructed string 'New_Script qEQxkOhGk7h @ eval(\'arwVgSozzzT55=Ma+th.ceil(bJJXBT5628/Ph67BUY eval(\'rmi8X8=Math.min(bJJXBT5628,Ph67BUY tlvk'+'yXT|=(sIyQgMm[\'qEQxkOhGk7h.charCo'+'deAt(YNOLA7+ sEJW6F2mhqmh =String[\'fromCha'+'rCode\'](231^tlvkyXT&255 Ebiuhp datfield Scribus 1.3.3.12 Scribus PDF Library 1.3.3.12 2008312053854 2008312053854' is part of the obfuscated script.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
2eac71f02764dccf747be10ed8262c8eb9ac2d62b1c15bff4a846b69b429b36e		 pdf-javascript-stream PDF /JS object 13 at offset 0x389 5945 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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