PDF malware analysis — malicious · cd8ef99db64f328e

MALICIOUS

PDF

5.2 KB Authoring application: Gisewouefirixahani (via abb69Nhowocsepacevajija)

MD5: 00d752007883f31a3b431e310ff35bed SHA-1: a2468c5f6b4c0d7db3c8352dcb8fb69ca8aa6aa8 SHA-256: cd8ef99db64f328e7918f8e0cce423f9f1c396ae3feb8e4f903199cc6810ad00

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence PDF_EVAL heuristic firing suggests that the JavaScript code is being executed, likely to download and run a second-stage payload. The ML classifier also strongly flags this PDF as malicious. No specific family could be identified, but the attack pattern is consistent with a malicious document used for initial payload delivery.

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_obj0010_000.js` `89950d83de673b46701d1e57750e501383864f14a9095874aca71e9ad824f436`	pdf-javascript-stream	PDF /JS object 10 at offset 0xF5C	813 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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