PDF / .TXT malware analysis — malicious · f6bf84382b97354d

MALICIOUS

PDF / .TXT

4.1 KB

MD5: f585a568c28235c29c372e5f924bb3ad SHA-1: 5be6c9b70101a4bc5f31a78785b7b9c6c73a629a SHA-256: f6bf84382b97354dc132914f516680b1450011f9b4b8c20c380be39fed85f4e5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is flagged by multiple heuristics including eval() calls and String.fromCharCode. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of obfuscated scripts and the overall high risk score. The specific attack pattern involves luring the user into opening a malicious PDF that leverages JavaScript to achieve its objectives.

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_obj0013_001.js` `bbe43386fc0577212cb0103558bef0a10714421e5e4a23d2937986a79313d8b3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6389 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `043b358e604a83484dbbfe11a6995279aef78abad43ab52b3aa11a75e1638afc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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