PDF malware analysis — malicious · 443ef9b3f94bf705

MALICIOUS

PDF

2.9 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: deec32b2f7e6aba78a66805688b65989 SHA-1: 6a9a682d71a43b166ff165dee73eb53b0897c730 SHA-256: 443ef9b3f94bf7056bd20881375f0a8709361981cf06266962891b7c71cb3551

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier strongly flagged this sample as malicious. The embedded JavaScript stream, named javascript_obj0013_001.js, is likely responsible for downloading and executing a second-stage payload. The exact nature of the payload cannot be determined due to obfuscation, but the presence of eval() and unescape() calls suggests dynamic code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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` `df6e915bb8a457d9875c0959594e2b9b18c52222d769dee5b9817e343364a78a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	3207 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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