Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f779acc2de34d…

MALICIOUS

PDF

641.0 KB
MD5: a711bd976922f697ec70ee0cde008680 SHA-1: 99f42a9af6d9e1484c71e0d1224169c288ed9f20 SHA-256: 312f779acc2de34da48e98a8c33e7e4c69ede1aef858cc5eec5c5641efeb6eb9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers heuristics related to PDF JavaScript exploits, including XFA form exploitation. The ML classifier strongly indicates maliciousness. While no specific script content was readable, the presence of these indicators suggests the document is designed to execute malicious JavaScript, likely to download and execute a second-stage payload. The embedded URLs are related to XFA specifications but do not appear to be directly malicious themselves.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS
    PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
  • 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/3.0/
    • http://www.xfa.org/schema/xfa-template/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

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