PDF malware analysis — malicious · 984565366e4c4fbf

MALICIOUS

PDF

7.3 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 39f0f46cb116c554641cc54f545e8a19 SHA-1: 37cb83100270bbca2c8e9f0deaa2c430c0ea9e62 SHA-256: 984565366e4c4fbfa332b275ddd7001fb9b37dc91d24ee653dde3bd2b61c0647

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this as malicious. The embedded JavaScript uses eval() and string concatenation to construct and execute code, likely to download and run a second-stage payload. The specific obfuscated string 'eval('gan0x=Math.ceil(gRqs9MpOz4/ODEFfdn eval('vgPOvwSTMMaj=Math.min(gRqs9MpOz4,ODEFfdn 'miH5fXEX|=(bsJpocilVOsMg['TXPu7.charCodeAt(ulwF0sCcLZyvI+ Wtg7qIfnyq1sFS 'NwgBCtPSY4=String['fromCharCode"] is a key indicator of this malicious behavior.

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_001.js` `770577a16ebb756518b28c1bc245d5214c8294b41dd36252015a7fa29540379c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D6	5859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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