Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8351a554c53df3…

MALICIOUS

PDF

45.7 KB
MD5: dab0733486546f231105a5608110d7d0 SHA-1: 13f45ec9a88a87976daac1d833e4cc07f4cf4e6f SHA-256: fd8351a554c53df3b8140a8f87fdc546f371e6874c7521c03c3a0e39c713bb53
114 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection for obfuscated objects, indicating malicious intent. Embedded JavaScript was detected, which is often used to execute arbitrary code or exploit vulnerabilities. The presence of XFA form elements and JavaScript actions suggests a complex attack vector. The specific JavaScript content could not be fully analyzed due to obfuscation, but its presence is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
2d2c48ad18f1a4d92ff12a19f4fdbc4fbb41c318f06699b1e14778d4ac3daa06		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1F1 4139 bytes

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