PDF malware analysis — malicious · 4036564c3e988fd9

MALICIOUS

PDF

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

MD5: 03fc8aea1affe5d6b3da4ec53c1117bd SHA-1: 1f6aefce606865c662dbf8dfe0bb1abb619e2180 SHA-256: 4036564c3e988fd97937789d0213bb1beaed72fe4726418db1fe1f52045566ee

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval() to execute obfuscated code. The script reconstructs a call to Math.max.charCodeAt, which is highly suspicious and indicative of exploit code. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF exploiting a vulnerability, likely to download and execute a secondary payload. The reconstructed eval string is the primary IOC.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
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` `d53c10df9f8d889844d2858abee705d94508ab652b08ed21ffd6b0a5a52b0a8c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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