PDF malware analysis — malicious · c631d80fc69011ba

MALICIOUS

PDF

2.8 KB

MD5: ecf3baa05d6b03602b4479ef10eba81d SHA-1: a596cd839965e4c7af833bc9a744cce584e23678 SHA-256: c631d80fc69011ba913a6f36451cf529da5dbb9570c8d2580dabf7da91fb543b

98 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 flags this PDF as malicious. The embedded JavaScript files are the primary indicators of malicious activity, likely responsible for downloading and executing 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `97bda6d35ec9db13f16c8787bf54ce15d0fa358f8d9d5ecac19f66d0695a37d8`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `8e1c9cab9f85ce66d41ae518fdabfdf4b8dafd8fb9d2c75b54a8087cf2d5b6b9`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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