PDF malware analysis — malicious · 991a494dbc536f68

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: 233637e53669e7b0e48cce40f77488ce SHA-1: 8814b8d72711a598e2e7d59199336928d399fd4f SHA-256: 991a494dbc536f685afd7723e707b259ec2df43fcc73a83fd7b3aae5981b2a33

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence heuristic, PDF_EVAL, specifically flags an eval() call within the decoded JavaScript stream. This suggests the script is designed to execute arbitrary code, likely to download and run a second-stage payload. The ML classifier also strongly indicates maliciousness. No specific family could be identified.

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` `5a509cfcb21af811283f69e6c0ad1de11d483d378c1f8f1326d262975e13c8ff`	pdf-javascript-stream	PDF /JS object 13 at offset 0x364	6435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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