PDF malware analysis — malicious · 9d4d731e9a65c8b5

MALICIOUS

PDF

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

MD5: d4d8a551e3db850bbef0d25cd690d554 SHA-1: 0d185da8d617b3761f69c2147de9e41a94154106 SHA-256: 9d4d731e9a65c8b5a40104070ee61c841b4e03a1489c1cc8e181fd2c18258680

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, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call within the JavaScript stream (PDF_EVAL) strongly suggests the execution of obfuscated or dynamically generated code. A machine learning classifier also identified this PDF as malicious with high confidence. The extracted artifact 'javascript_obj0001_000.js' is the likely source of the malicious payload. The primary attack pattern involves leveraging JavaScript execution within the PDF 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` `4c89d74d136c783b1cb7fe0896873eec93d2bbe0472cc5a92c13f3e73c09bf3a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x5864	773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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