Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e971147d0d4d6…

MALICIOUS

PDF

45.7 KB
MD5: 4ee46f8b566623c93830ba3d53b5becd SHA-1: 7386997b61b7abc3ed59a934e151e066db78c973 SHA-256: 840e971147d0d4d674ee63d9e98208fe7ceeb43fd0f0e68674f2771841d5df93
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The presence of XFA form elements also suggests a complex document structure often used for exploitation. While the document body is heavily obfuscated and unreadable, the embedded JavaScript is the primary mechanism for malicious activity, likely to download and execute a second-stage payload. The specific URLs extracted are related to XFA and Adobe, but their reputation is unknown, warranting caution.

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
8ced1a542d4dbafb337f63b06b381c1bddcdf977b88fc3a849021401441bef23		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1ED 4061 bytes

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