MALICIOUS
178
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.002 Malicious File
This PDF file contains a high-severity XFA script that acts as a stager, indicated by the 'PDF_XFA_NUMERIC_EVAL_STAGER' and 'PDF_XFA_SCRIPT' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL, while seemingly benign, is part of the XFA structure and may be used in conjunction with the script to fetch additional malicious content. The script's primary function is to evaluate numeric expressions, a common technique for obfuscating and executing malicious code within XFA forms.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 5
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XFA form contains risky executable script high PDF_XFA_SCRIPTPDF 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.
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ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTIONClamAV detected this file as malware: Js.Exploit.HTML-30
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XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGERPDF 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.
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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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Embedded URL info EMBEDDED_URLOne 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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