PDF malware analysis — malicious · 31aefcb620ce0fbf

MALICIOUS

PDF

1.95 MB Created: 2011-72-51 03:25:00

MD5: 198c6a0387485d9ae251b08030f1ec1d SHA-1: 832fbb586bd07edea17ebe33ebabce566b749a5a SHA-256: 31aefcb620ce0fbfd09b5674fe1930722e08eaffc225fd7e895ff0c7b7e6c079

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious JavaScript

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The embedded JavaScript file, javascript_obj0001_000.js, is likely responsible for executing malicious code, potentially downloading a second-stage payload. The eval() call within the JavaScript stream is a common technique for obfuscating malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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` `f69a50f98d642100215186921881e2a253c1c4066d62555507468c3899089978`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6187	542 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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