Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05be79d57498e94…

MALICIOUS

PDF

32.1 KB
MD5: 30b00f9d154da06dc3c70e90b7179cf4 SHA-1: 79068aef6e78e20b4db57d7707ffb4b3ee09d5da SHA-256: a05be79d57498e94de67ccec243cf470988051c61ed3613e3b467b0e36e99ab2
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains an XFA form with executable script, identified as a numeric evaluation stager. This stager is designed to download and execute a second-stage payload. ClamAV detection as 'Js.Exploit.HTML-30' and a high ML classifier score further confirm its malicious nature. The embedded URL is likely part of the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • 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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