Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937c9675906f1e0…

MALICIOUS

PDF

45.0 KB
MD5: 29c02002eb1d8723322dcf50995e6b60 SHA-1: 5799edee31de16cb939cf1ca35efe9e44a8053bb SHA-256: b937c9675906f1e049e18c96935d21a94b048c3bacb6e10197899eb436b9a927
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent. While the document body is heavily obfuscated and unreadable, the presence of JavaScript points towards an attack pattern involving the exploitation of PDF vulnerabilities to deliver a malicious payload. The embedded URLs are not directly indicative of malicious activity but are part of the document's structure.

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
6b9ed37933f9318df538c5f8af4cd9b409f9ce1848717f7dc557adb4eaafd861
pdf-javascript-stream PDF /JS object 12 at offset 0xA1F2 3524 bytes