PDF malware analysis — malicious · 9f7415724a01ce4d

MALICIOUS

PDF

8.1 KB

MD5: 066a6de9b1e73c544dd1fbbfc2336cb4 SHA-1: d55492fe6e5750ee655949ca4a4471614caeed3b SHA-256: 9f7415724a01ce4d851e8e96c2287f10d162d509355425eba0c193b581b38bf7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated and uses eval() and String.fromCharCode. The ML classifier strongly indicates maliciousness. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the nature of obfuscated JavaScript in PDFs. No specific family could be identified due to the obfuscation.

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` `bf8ff88f729182908f765b6595e25ad1ea382c9cc9f128eaf1f9a8bf01347c21`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14339 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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