PDF malware analysis — malicious · f3875a1a3bb2409f

MALICIOUS

PDF

4.6 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: af5d2a2351038f08c500519d515801d7 SHA-1: ef26974b3122c9bf85e9fbac8988b4b9dc494710 SHA-256: f3875a1a3bb2409ff540276be9ebafb92c6e9d7fb55b38568bce3a693c56d270

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-severity PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a secondary payload. The ML classifier also strongly flagged this PDF as malicious. No specific family could be identified, but the techniques used are common for initial access via malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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` `625cd24440e169540921f686edae5dc4573a1a254b6171209db83506b891342a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x367	6289 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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