PDF malware analysis — malicious · ca95e2d893abdae4

MALICIOUS

PDF

26.3 KB Created: 2011-10-06 11:16:07 +03:00 Authoring application: Wiki Bc Student Loans (via mPDF 5.0)

MD5: 0d2cb1efef622c807285b540088c777f SHA-1: a7ca787ac88b81f5be4a67b1bb9535ffed6210e6 SHA-256: ca95e2d893abdae4d284d694dedddd5d352d5962620ad38b2284cc2c70081a52

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript streams. The heuristics indicate the presence of JavaScript actions and the use of unescape() for obfuscation. The extracted JavaScript files, 'javascript_obj0020_000.js' and 'javascript_obj0020_001.js', are likely responsible for executing malicious code, potentially downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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 0x6267	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 0x6267	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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