PDF malware analysis — malicious · 720805cfa3b0206b

MALICIOUS

PDF

45.0 KB

MD5: 0332491dcaf222406c271804122afa0b SHA-1: 30ab07886bc3a2bfb47d98fc20cfb06e077cdfee SHA-256: 720805cfa3b0206b230cc569090414aecb56f489d021cf1bacad82dde635a217

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it contains an exploit. Embedded JavaScript streams were extracted, which are heavily obfuscated but likely intended to download and execute a secondary payload. The presence of JavaScript and the exploit detection strongly suggests a client-side execution attack, commonly delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV 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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `96dacc139b3bcb3a6ff7204a4da2c121740489b4220b05591be495a295c10c12`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	45305 bytes
`javascript_obj0008_001.js` `ade92c3aefd2cb79453b26b3e814f10d6cbe219f987c9cab3c77d3b558529ed0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x20A	45555 bytes
Detection ClamAV: Pdf.Exploit.Agent-36128 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `a7e7b731e3e8f78c5cdbfc9776ddb2b304aceb816e52892e5afba47ed0640b1d`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1E7	33047 bytes

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