PDF malware analysis — malicious · 51622fcd524fab15

MALICIOUS

PDF

3.6 KB

MD5: 2912257c22770e621526a3be5b7dd920 SHA-1: 22575b0d1d2bafecacd68cb553177615940ea80a SHA-256: 51622fcd524fab15b71c1ffe3a1a16710182202b5001be81f0876095dc804d0c

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for obfuscated code execution, as suggested by the PDF_UNESCAPE heuristic and the 'Script obfuscation indicators' triage signal. The primary function of this script appears to be downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `20131de7615aa70d3c84d6ea7e0771bbad53ab2209f71e859af00f4e69e07eb4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1AA	2395 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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