PDF malware analysis — malicious · 3ef9890cd068dae5

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00

MD5: e3013ded578cd3be2e92fa66722a9a51 SHA-1: 43aa780329ac68d38c6451624b4a53a9421e5d1f SHA-256: 3ef9890cd068dae515ce7298d36ee2eabea93286309b249e38dcce39842b2001

90 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 contains embedded JavaScript, which is flagged by multiple heuristics as malicious. The JavaScript stream includes an eval() call, indicating obfuscated code execution. The ML classifier strongly suggests maliciousness. The primary attack vector appears to be the exploitation of PDF vulnerabilities through embedded, obfuscated JavaScript to deliver a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0001_000.js` `8dbfef42cf9cf29a52de646dde3f6db912487de3ec374c4961b76868abe5e634`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6439	870 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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