PDF malware analysis — malicious · 4da03a849aebac0a

MALICIOUS

PDF

4.6 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: e54f50419558eedfbe9a34c1347e3b69 SHA-1: 3cd4e926f8c4ba213d24049990a402b9d68be6da SHA-256: 4da03a849aebac0a118734b98dda29b105910797b12280d2e2961ba5ccc09af9

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification. The JavaScript stream is obfuscated and uses an unescape() call, indicating malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of an embedded JavaScript file. The obfuscation and use of JavaScript point towards a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0006_000.js` `a096b55439319744ee36f85e4a1d5307d871b3bf02fbd7ff3de039a180f449b2`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5F	167 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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