PDF malware analysis — malicious · f7591a5918b70128

MALICIOUS

PDF

124.7 KB Created: 2009-12-18 11:47:57 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)

MD5: 1aea41508fa22876af19e0d3186fedfd SHA-1: ef2cabb85f3cbd78d07968c407d922f7c787cc9f SHA-256: f7591a5918b70128f6645dedaca11ddf6c9cb8eb20a8d84c4d256fd2e8c4facd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained heuristics indicating JavaScript execution and obfuscation. The embedded JavaScript stream, named 'javascript_obj0029_000.js', is highly suspicious and likely responsible for the malicious behavior. The primary attack pattern involves leveraging embedded JavaScript within a PDF to achieve code execution, potentially leading to the download and execution of further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `cf9dd0a32be6f0c4abee576b8d08e024f6c5c251ba054da9e31c28e1d21a152b`	pdf-javascript-stream	PDF /JS object 29 at offset 0x74B	3249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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