Malicious PDF — malware analysis report

Static analysis result for SHA-256 1716561d9ff65c2f…

MALICIOUS

PDF

45.5 KB
MD5: 46c52d0fbc5abba27aca99c20a404833 SHA-1: a4f4c1614338aaa9d5687483fbbb566bdb05ca98 SHA-256: 1716561d9ff65c2f6862511c99ac4514e5eb12eb3e9a3a9cf376644a0b48dc7f
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 that is flagged as an exploit cluster, indicating it is designed to execute malicious code. The JavaScript is heavily obfuscated, but the presence of XFA forms and exploit signals strongly suggests it's used to download and run a secondary payload. The benign URLs extracted are likely decoys or unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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
72f4099e589629b1e851e5de231251adac3938ff394fe6d1f8599c712acfde1b		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1D0 3987 bytes

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