Malicious PDF — malware analysis report

Static analysis result for SHA-256 711ef3dc09c4a988…

MALICIOUS

PDF

2.7 KB
MD5: 4e16d414e4a9707dbf15b4fa61353795 SHA-1: 04399d4f1a68b2abaf3e9da7c24f67ab20f96cdf SHA-256: 711ef3dc09c4a9881ec4c9286c4fb9a81be3af8f3a8a41c7bd2e87b6ade1b43e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is flagged as an exploit cluster targeting XFA forms. The script appears to be heavily obfuscated but likely downloads and executes a second-stage payload. The presence of a RichMedia (Flash) object further suggests exploitation. The benign URLs are likely decoys or standard PDF/XFA schema references.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_obj0006_000.js
32b9fa0c8915d22d2ae85bac9b096baa4b4f9d13158560bb15f5c216330558ec		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 1585 bytes

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