PDF malware analysis — malicious · ad6c8a4f74c037d6

MALICIOUS

PDF

4.0 KB

MD5: f7c2fb80c06eb80fe1b5e49f68b7980f SHA-1: aaab1c3136ad47b969da905e5a23c0dc6437fe71 SHA-256: ad6c8a4f74c037d6252fefd9100b8bf0417cbf3fed5c05adf25290f691950b99

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The extracted JavaScript files, particularly 'acroform_b64_00.js', are likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious intent of the document.

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` `973bccf04e788b8bf383f128e55a6ed947b6198544950c8b13b4c9a0b9221b55`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6209 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` `9f614aa64c1d64c291e0e969cf9b00f9c141321f8fb9903a9ae4d014ded636c0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3502 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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