PDF malware analysis — malicious · 8de32c3f481ac9c6

MALICIOUS

PDF

3.4 KB Created: 2008-12-12 18:24:11 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: b759554e31066830e59301f12156fc98 SHA-1: c04c2faf71f14c6fc814037baf31990ae2bf338f SHA-256: 8de32c3f481ac9c6d63f7e010a20d1969a6fa2f8c8f50f62a6a04a5b44174f8d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript/TypeScript

This PDF file was flagged as malicious by an ML classifier with a high confidence score. Static analysis revealed embedded JavaScript streams, including one that was deobfuscated. The deobfuscated JavaScript contains eval() calls and String.fromCharCode, indicating obfuscated code execution. This pattern is commonly used to download and execute further malicious payloads from external sources. The presence of multiple JavaScript-related heuristics and the ML classification strongly suggest this attack vector.

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_000.js` `f548459edcc27b92ef4171785641cdf042f1335cd3acd432fe166bdb524aaebe`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7173 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `68e86a062d9ef01c73509e3456f02bb53bb4c61507209ffbddf4367d4ce28a10`	deobfuscated-js	PDF JavaScript deobfuscation pass	16335 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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