PDF malware analysis — malicious · 3a8b0d460a37ecf1

MALICIOUS

PDF

26.5 KB Created: 2010-12-28 19:29:17 +02:00 Authoring application: Small Business Loans (via mPDF 5.0)

MD5: b61a857379080bf1b72e3f25dabe4651 SHA-1: 094fb4817a77960ec438c0cedd1007216b59ce0b SHA-256: 3a8b0d460a37ecf138e40993cad3a618462cf0bc212705262ae463aa49a30173

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, which are obfuscated and utilize unescape() calls, indicating malicious intent. The ML classifier strongly flagged this PDF as malicious. The extracted JavaScript files are the primary indicators of compromise, suggesting the PDF is designed to exploit vulnerabilities and execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x61EF	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x61EF	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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