PDF malware analysis — malicious · f52820ab736cbbf4

MALICIOUS

PDF

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

MD5: a4c760c862bf15c3288dbbc7fd5c5c01 SHA-1: 4956eeb051ed6254a2e481bab335e57472cf5feb SHA-256: f52820ab736cbbf4dfaa01abf3d69b1c60714ecf6ca1092c175bb422911e1663

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, named 'javascript_obj0001_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `6dd562618a7a4a9df847318074ce632fb5f94432595539aa06588b2cc3a9f9eb`	pdf-javascript-stream	PDF /JS object 1 at offset 0x57D2	667 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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