PDF malware analysis — malicious · d24031dc379e4923

MALICIOUS

PDF

5.2 KB

MD5: a1d12ab798e41cf81fd1dc2bf174a6d3 SHA-1: ccc6f0381d4b3b901250b60c913f84c958a1f9f5 SHA-256: d24031dc379e49232a410f5f40c3a1b1cf44fa997340aea0279ae17daa0ce77a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, flagged by heuristics for eval() and String.fromCharCode usage, indicating obfuscation. The ML classifier strongly suggests maliciousness. The embedded JavaScript file, 'javascript_obj0013_001.js', is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

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_obj0013_001.js` `32e89937047518aebc17c4eb54b0486084591f9ede58aa07e9304403f2b9e1ce`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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