PDF malware analysis — malicious · 539ec2afba2a16dd

MALICIOUS

PDF

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

MD5: a66dda67ef1b7587d61403c96af3ed1c SHA-1: e627d6d5311eb6d0a2206ee107b01da72f5488c2 SHA-256: 539ec2afba2a16ddb46ab5fa2bf5197c0ce75557daf81aee87cfe6dd5e076268

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is heavily obfuscated, indicated by the 'eval()' call and ML classifier flagging it as malicious. The presence of JavaScript actions and streams, along with the 'ML_NYX_PDF_MALICIOUS' heuristic, strongly suggests that the script is designed to download and execute a secondary payload. The obfuscation makes it difficult to determine the exact nature of the payload without further dynamic analysis, hence the confidence level.

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` `5d0bca201fd8baa62d78198bb11ad0880390ecbbd24725ae50bfc4b75eb5505d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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