MALICIOUS
168
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
The PDF utilizes XFA forms and contains an embedded JavaScript payload, as indicated by multiple heuristics and ClamAV detections. The embedded script, though truncated, appears to be part of an exploit chain designed to download and execute a secondary malicious artifact. The ML classifier and ClamAV detections strongly suggest malicious intent.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 5
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ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Dropped-78
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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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://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_00000329.bin7e977f88f2cfb14ad1a71da395af5dfb57f3bfca772fc25c05a7de64b9b823d9 |
pdf-embedded-script | PDF raw stream script payload at offset 0x329 | 18345 bytes |
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Detection
ClamAV:
Pdf.Exploit.Agent-36809
Obfuscation or payload:
unlikely
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