PDF malware analysis — malicious · ef1a5f605d26061b

MALICIOUS

PDF

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

MD5: c74056494e36ae2c716cdd7851654eb0 SHA-1: 7a492e737608aaaf24671b1bf2531f0b66d32c26 SHA-256: ef1a5f605d26061b859b1861639d374f8079a0c41bfa68dd78b8687233a026cd

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the decoded JavaScript stream (PDF_EVAL) strongly suggests that the script is designed to execute arbitrary code. The ML classifier also flagged this PDF as malicious with high confidence. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is obfuscated. No specific malware family could be identified.

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` `50187a219454e811b602dc518fb1288e1ad531e3f6648744fea2e4f56073f381`	pdf-javascript-stream	PDF /JS object 13 at offset 0x367	6378 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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