MALICIOUS
60
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The PDF file was flagged by a machine learning classifier as malicious with a high probability. Static analysis revealed an embedded JavaScript payload within a PDF stream, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. This script, named stream_000_off000003b6.js, is likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious nature of the document. The presence of XFA form elements also suggests a potentially complex document structure often used to host malicious content.
Machine Learning
- Nyx PDF Classifier malicious score 0.9994
Heuristics 3
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Embedded script payload in PDF stream medium 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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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
stream_000_off000003b6.jsf4f680551cd4e6d199e3d466ac7188769dfd80c649771e6d24273104e0fab83b |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x3B6 | 26344 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 long base64-like blob(s).
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