PDF malware analysis — malicious · 4bf37b0a6c002994

MALICIOUS

PDF

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

MD5: b021be347a204607b6b39f526a9c2765 SHA-1: 3811555bdff19f37f723f50b57e6bd62226f9f16 SHA-256: 4bf37b0a6c002994531d052725df7b0dde03e6b5f7ff8700c3cad15c0ba3a70a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest the JavaScript is obfuscated and designed to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are likely responsible for downloading and executing a second-stage payload, although their specific actions are not fully detailed in the provided evidence.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `f328f600abb03ce5e64b26de8726b799c7259741779b76679336e575187d4777`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	6958 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `f82f041906ffdcdbba696273ea292c2a728f3880fb32eeaf109c70bfe93b5836`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x71F	4540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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