MALICIOUS
116
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript within an XFA form, a common technique for exploiting PDF vulnerabilities. The script attempts to download and execute a second-stage payload, indicated by the 'ML_NYX_PDF_MALICIOUS' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. The benign URLs are likely unrelated to the malicious activity.
Machine Learning
- Nyx PDF Classifier malicious score 0.9979
Heuristics 5
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ClamAV: Pdf.Malware.Agent-7872242-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Malware.Agent-7872242-0
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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOADPDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xfa-template/2.5/
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_pdf_script_00000303.bin441ef8500fc2f011ab74c6bbb1e75e3c67d3069973605b8618d74d4ccd15bb16 |
pdf-embedded-script | PDF decompressed stream script payload at offset 0x303 | 25594 bytes |
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