PDF malware analysis — malicious · 9d51de470ac2cc28

MALICIOUS

PDF

26.1 KB Created: 2011-01-17 00:54:41 +02:00 Authoring application: Online Signature Loans (via mPDF 5.0)

MD5: e53c62d91950af8ff6263c2f9161d630 SHA-1: 6ccd142a7dae582340f21959639d8517e9faf927 SHA-256: 9d51de470ac2cc28bc41b482c34bb5ce177a543e615ec2f56cbc899f6f5bf9e8

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF contains embedded JavaScript streams, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The ML classifier strongly flagged this PDF as malicious. The extracted JavaScript files, javascript_obj0020_000.js and javascript_obj0020_001.js, are obfuscated and likely responsible for executing a malicious payload. The unescape() call further suggests obfuscation techniques common in malware delivery.

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 0x6129	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 0x6129	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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