PDF malware analysis — malicious · 8dc3eadc5ec150b4

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 3467 (via 3467 2.5)

MD5: c793ad7df440b28ac550d07ac8c4d049 SHA-1: ab49e93b2c615d89c63b804123e242bd18b0833d SHA-256: 8dc3eadc5ec150b4da6934b452ac6da0f60dcb69a55424602722802eeba1f983

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing eval() and unescape() calls, as flagged by PDF_EVAL and PDF_UNESCAPE. The ML classifier strongly identified this PDF as malicious. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the presence of the extracted javascript_obj0013_001.js artifact. The confidence is high due to the strong ML signal and multiple heuristic firings.

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` `0dab23d3a4c4cbabf2ea31715e6d49644fefb12fd220bf3791ef37a7333c7059`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72554 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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