PDF malware analysis — malicious · b4f871427976123c

MALICIOUS

PDF

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

MD5: c397046d8387a5c8f6b8b8c0804818cc SHA-1: cfcd0b670efb80a9b3b7c648b2c29fd11366cf89 SHA-256: b4f871427976123ca5bf0db2b79652c3451e1a0cd56a7bb96a036927fd17c963

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

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 malicious code, potentially downloading a second-stage payload. The specific obfuscation techniques used within the script are not detailed enough to reconstruct specific commands or URLs, but the presence of eval() and the ML score confirm its malicious nature.

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` `c31751fa9b86414cb3fc8ccaa3d42c6d0a5e15155fc1b4e15313b3c5d3893912`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6515	838 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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