PDF malware analysis — malicious · b51085200a5c8df5

MALICIOUS

PDF

3.1 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: 22dc4c6ccbd2cc3ad1f4712380d51ab2 SHA-1: daabb11c0304b8c19d28de798f600fb5d53ca854 SHA-256: b51085200a5c8df509afc654f2347e0f188b7ee20d8dfcc85cd2710d86f1b266

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream, named 'javascript_obj0013_001.js', is likely responsible for executing the malicious payload. The presence of unescape() calls suggests obfuscation, common in exploit delivery.

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_obj0013_001.js` `85ac38e74f9e225f51ae4be9b5943f52d1043c095553d8b6a5e08913fd0cbd79`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37D	2681 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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