PDF malware analysis — malicious · d97d2a7cbfde5356

MALICIOUS

PDF

3.5 KB

MD5: f59274dd070c6c338f4de3b04184078c SHA-1: 3a91d8a8039aedd875e6e850e297ea6c5a6eb954 SHA-256: d97d2a7cbfde53563a5f264cad3cb5c57a51ea75085d5a9a952d055f6a021dc3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as javascript_obj846059_000.js, is heavily obfuscated and contains eval() calls and String.fromCharCode, typical of downloaders. While the exact URL is not directly visible due to obfuscation, the script's purpose is 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 (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_obj846059_000.js` `3df6ac6a10362e876fe11c6e37477af388c81eb47fc02eb5fdce7a687d0f91d2`	pdf-javascript-stream	PDF /JS object 846059 at offset 0x138	5759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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