Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5311d12fd392161…

MALICIOUS

PDF

29.9 KB Created: 2010-11-29 10:29:36
MD5: 7afa08065828fbbcb1dc3f92f3aa3787 SHA-1: 9bca46a93b4a87271de6722f9cde0de827558e54 SHA-256: b5311d12fd39216145f7e40fa3f0b20a600e53386c772a2735c9a227a9b4bbb4
194 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript and triggers critical heuristics related to PDF JavaScript exploits, including XFA form exploitation. The ML classifier also flagged it as highly malicious. While the specific JavaScript content is obfuscated, the presence of exploit-related signals strongly suggests it's designed to download and execute a second-stage payload. The embedded URLs are related to XFA, but their reputation is unknown or benign, so they are not considered primary IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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/

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