PDF malware analysis — malicious · 50141297b34958c7

MALICIOUS

PDF

5.1 KB

MD5: ef22648800cd76afdb444f16d8b01431 SHA-1: e1e62a9a41712e6d5d37d8e0793d6c2de11f1640 SHA-256: 50141297b34958c7160d5b5f2e8c64865d2fcecbe9cd55cc049352241b91d31c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a machine learning classifier and exhibits high-confidence heuristic firings for JavaScript execution and obfuscation. The embedded JavaScript stream, identified as 'javascript_obj4071_000.js', contains eval() and String.fromCharCode calls, indicating an attempt to execute obfuscated code. The primary function of this script appears to be downloading and executing a second-stage payload, though the exact URL or payload is not directly discernible due to heavy obfuscation.

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_obj4071_000.js` `2c58c3f79a5d783ad036c27f91ab8b7285cda8ec07021002ade3b072e18d6f08`	pdf-javascript-stream	PDF /JS object 4071 at offset 0x138	8358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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