PDF malware analysis — malicious · a058603d9bdeb0c6

MALICIOUS

PDF

9.6 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c30a3aaaf0af8ff6c39366024fc36eda SHA-1: fa46122a2c09fa3e91405bc01304f5e31e81f38e SHA-256: a058603d9bdeb0c6518d04e4af55a734fe31de49e03fa43b962de05ed4150c5b

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier also flagged it as malicious with high confidence. The embedded JavaScript stream, named 'javascript_obj0013_000.js', is the primary artifact. The presence of 'eval()' calls within the JavaScript suggests code obfuscation and dynamic execution, a common technique for downloading and executing further malicious content. The document body contains obfuscated JavaScript code that appears to be constructing a call to `Math.fromCharCode` with a large number of arguments, likely to decode a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_000.js` `bf58b719d082ed6d66bd0dbc73403c073a3acfe7bd2df08421ec3f61dcd399ac`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	8287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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