PDF malware analysis — malicious · 2ac415fcf3cbd03f

MALICIOUS

PDF

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

MD5: 9fce60f5a708cf0a6798c6d3a05d3a3b SHA-1: ae183a138870b335bdee94e2a60dbded194f6fdd SHA-256: 2ac415fcf3cbd03f9a8ab52eae9b1b9b50aa6ea88f028c140046cbf12bd6a97d

88 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 including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The JavaScript stream, named 'javascript_obj0001_000.js', is likely responsible for executing the malicious payload. The eval() call within the JavaScript suggests code obfuscation and dynamic execution, a common technique for malware delivery.

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` `bc7e95d4295679351c93cfbd95b6a42845773129b747844a9c1158389c494cb9`	pdf-javascript-stream	PDF /JS object 1 at offset 0x63B8	885 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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