Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c91fdd5a9d07560…

MALICIOUS

PDF

32.9 KB
MD5: 1c4880281680d21aa7755efa9a3f6fa1 SHA-1: 37dad5c7d4456d32f34c847c929a0282f35f6d07 SHA-256: 8c91fdd5a9d07560f2c554c0c013c905091bb5894b3a9e8d7cb6d06e758b98b6
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.007 Abuse Execution: JavaScript

The PDF contains XFA forms with executable scripts, identified as a numeric evaluation stager. This indicates the document is designed to exploit vulnerabilities or trick the user into executing malicious code. The embedded URL, while seemingly benign, is associated with XFA schemas and could be part of a larger exploit chain. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER
    PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
  • 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://www.xfa.org/schema/xfa-template/2.5/

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