PDF malware analysis — malicious · fcec619c2c8a6a01

MALICIOUS

PDF

4.0 KB

MD5: e7e1b0bc9255fa431a3395d156aec9fe SHA-1: fc4ad133cc8e29d3dff876051c4a2fcc06e43e91 SHA-256: fcec619c2c8a6a01ac6eaa85d397752b9ce7692c7c1300ddfc28fc436575fd33

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The JavaScript stream utilizes eval() and String.fromCharCode, suggesting obfuscation to hide its malicious intent, likely to download and execute a second-stage payload. No specific family could be identified due to the generic nature of the exploit.

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` `4a8323147508ddea94226f20f2435251badbbf1a4dcf8cef8eeb212889f1a165`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6325 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` `2138342beb3fa524a394d6c0550924f629f6aa5112b80af6b67dfaeb5420a48b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3589 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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