PDF malware analysis — malicious · 1a1896d3b78da7f3

MALICIOUS

PDF

9.9 KB

MD5: 057ac5b3a52888e862134dee426c0d70 SHA-1: 78d6d71126ee102ccd807dde95068fc65f9aecf6 SHA-256: 1a1896d3b78da7f3f65d8fb27f46aff69c25c900bd41bac9300e704f84cdc8a3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The JavaScript streams, named javascript_obj7037_000.js and javascript_obj7037_001.js, are the primary mechanism for executing the malicious payload. The obfuscation and use of eval() suggest an attempt to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj7037_000.js` `624804016dec307a92bad0ff4f802fed204aed3ae45d9439b6903853ca44d32c`	pdf-javascript-stream	PDF /JS object 7037 at offset 0x8A	9780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj7037_001.js` `bd91b47eea319ee6aae3c9a7cc3b6e0ec5695960b7e07aea6d953606ba18b222`	pdf-javascript-stream	PDF /JS object 7037 at offset 0x8A	8033 bytes

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