Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafa5e292783af50…

MALICIOUS

PDF

45.5 KB
MD5: bcf524aa4587760a8fe0591f87c38eeb SHA-1: e423b6cf60b7c5f81c237d86520740a9b68fcba7 SHA-256: cafa5e292783af501fdf4d91cf80cebc36d7c087d2bb060d7f2eed78ff20e1ab
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier also flagged this PDF as malicious with high confidence. While the document body is heavily obfuscated and unreadable, the presence of JavaScript suggests an attempt to execute malicious code. The specific intent of the JavaScript is unclear due to obfuscation, but it is likely to download and execute a second-stage payload or exploit a vulnerability. The embedded URLs are related to XFA forms, which are sometimes used in PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
ed819be88902561612ca4205c428f8f8147c6c491d57ab1cb014b87e2d72c9dd		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1FB 3837 bytes

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