PDF malware analysis — malicious · 49884f86e50ff72b

MALICIOUS

PDF

2.6 KB

MD5: e183ad484db011323723b0c2e9ac37d5 SHA-1: d9cc30a877b458ccc6541be28e736c40b02e5d43 SHA-256: 49884f86e50ff72bbee6727a94dbe4bbb75ec9f428d6ce0a1efe772ece891171

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests that the JavaScript is obfuscated and likely uses eval() to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams, javascript_obj111711_000.js and javascript_obj111712_001.js, are the primary artifacts for analysis, and their obfuscated nature points towards a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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. (matched inside decoded stream)
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_obj111711_000.js` `f66d3a3739503dbd5017a89327e09d6944467b105d3d0f25c426c4227d0dfcb6`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `57e4ff3ab92d86dd98361ca9d241e8cc389bac5064077f820bf569b12703ca83`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x249	2940 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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