PDF malware analysis — malicious · 3ae19855685be6a9

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 3828 (via 3828 2.1)

MD5: eb69bb5d4d38fd0e4f2cbbe5b34e3c85 SHA-1: 682f76b1c1c32d08c25c31abaadb9cdbaa038d98 SHA-256: 3ae19855685be6a94e5e9b1e8461ef26f747ec8bf959dec98ab06486a233f80a

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as 'javascript_obj0013_001.js', is heavily obfuscated and uses 'eval()' and 'unescape()', suggesting it's designed to download and execute a secondary payload. The confidence is high due to the strong ML signal and multiple heuristic firings, but the exact payload and delivery mechanism remain unclear due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `deb734c30513fc69be578131069daf5f87c18abdeb6622bbcfb895d1ca69b67d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72898 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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