PDF malware analysis — malicious · 23bf00dc5822b602

MALICIOUS

PDF

9.7 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: e15fd2038ea6f6a4ec4083da6d1072ea SHA-1: c8b293e0450a8da31956ba342e640229c48986a5 SHA-256: 23bf00dc5822b602661a37c8ce79063c00ec0a9e7e0977a9520a0532e7eb54cc

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_LAUNCH heuristic suggests an attempt to execute an external file, and the PDF_EVAL heuristic points to the use of eval() for obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0027_000.js', is likely responsible for downloading and executing a second-stage payload, although its specific actions are not detailed here due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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_obj0027_000.js` `6ca5dff6d3056886961c6757ac1657f970015f3d63037d09ff863de4e9921b16`	pdf-javascript-stream	PDF /JS object 27 at offset 0x1C1B	3338 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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