PDF malware analysis — malicious · 44217c7fb80c077e

MALICIOUS

PDF

3.5 KB

MD5: e3cfdc23ab42aecfce222e537e0a8a4a SHA-1: 1231ce1751450b8ed45e6cf971c9cb86bf365c7d SHA-256: 44217c7fb80c077ee99424dd1377597a1d12e63b553c39e3fa5b3842cc668a02

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious code. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as suggested by the obfuscated nature and the use of eval().

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj6517_000.js` `839da87542168a7968be184403aea88e12e719029bfc9e9aacd221d5aa69231f`	pdf-javascript-stream	PDF /JS object 6517 at offset 0x139	5744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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