MALICIOUS
186
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The PDF file contains embedded JavaScript that is obfuscated using string concatenation and a custom Base64 decoding function. This script is designed to decode a further payload, likely to download and execute a second-stage malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent, pointing towards an exploit targeting PDF vulnerabilities.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 5
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ClamAV: Pdf.Exploit.Agent-36175 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-36175
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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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ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEXHex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0008_000.jsd58b3960c8133aea7b8d2e45c7f45c2b4d5b20ff157d63aaf8114a1253e95d96 |
pdf-javascript-stream | PDF /JS object 8 at offset 0x1E7 | 127268 bytes |
|
Detection
ClamAV:
Pdf.Exploit.Agent-36175
Obfuscation or payload:
unlikely
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