PDF malware analysis — malicious · fb6cc19cc5188dd5

MALICIOUS

PDF

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

MD5: 231cc660a4b01a67fec37fb9a19d724c SHA-1: feb2f56d0e90a7fa416d40dd17e093c4083526f0 SHA-256: fb6cc19cc5188dd5a9a1e23d36769e0c88b4928846e8ada1a5ab47e9f5badff2

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF sample contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded JavaScript uses eval() calls, which are often employed to deobfuscate and execute malicious code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the use of eval. The file's authoring application and creation date appear to be fabricated.

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` `e17eda08ecdec4256e2aeb856fa69b458398f191a4e388dd143bcc95faa4fcfc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x392	5107 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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