PDF malware analysis — malicious · d95d50953474f844

MALICIOUS

PDF

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

MD5: a081da3db7ab0bb1f5dc4103781b350d SHA-1: 4cb5c8ad161967e5752ec90283c9072d3a123e25 SHA-256: d95d50953474f844119bdd69dffcc576b9c42a2424cb6cd9a3779efd77e1746c

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A high-confidence ML classifier also identified it as malicious. The JavaScript stream contains obfuscated code that utilizes `eval()` and string concatenation to construct and execute commands, specifically `String.fromCharCode(39^gBIqeXEx4kSwle&255)`. This indicates the script is designed to download and execute a second-stage payload. The presence of `eval()` and the ML classification strongly suggest malicious intent.

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` `4b6617d9aba6a50dcbdbfdf73dfc73440220eb637f59fef79b13e4c8d524f712`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	8505 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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