Malicious PDF — malware analysis report

Static analysis result for SHA-256 0944b6045c308544…

MALICIOUS

PDF

45.5 KB
MD5: 1539413d2223d53e702d2c2166d0b077 SHA-1: 7fc6678203d65eeaf0439b08e88985d09c8939e8 SHA-256: 0944b6045c3085444e0d65f08e8b335364df3cf8af14abf89122e6cbccf85252
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified as a PDF JavaScript exploit cluster, which is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While the specific family is not identifiable, the attack pattern is consistent with a malicious document used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
227f5d4601ec8d89581cf8cda0fb3f9e042b359cf7623c3a905357011b89a1db		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E1 3894 bytes

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