PDF malware analysis — malicious · b68741454b002c8a

MALICIOUS

PDF

3.4 KB

MD5: de9eea15678f2067bae746c8cb1e7e38 SHA-1: d98f345d6e033f7fcb86e220ccd7921f22ed2bd7 SHA-256: b68741454b002c8a06bf1abc04f1586c56af3ec453a9ddcb68d1519d92387fb5

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded and obfuscated JavaScript, as indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded JavaScript, named 'javascript_obj0006_000.js', is likely responsible for executing a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9871

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One 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
`javascript_obj0006_000.js` `c8321c22f760e6ea5759fa00f4fc4ac2a597c3944addf8832175f72de449505c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1BA	2152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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