PDF malware analysis — malicious · 34ec7da91cfbff0e

MALICIOUS

PDF

26.1 KB Created: 2011-01-24 16:49:05 +02:00 Authoring application: Loan Prospector (via mPDF 5.0)

MD5: 91850227b545033377c49f869631e34d SHA-1: 63620d2c6437e96ac8ac65a9b3708d6d3bfc864a SHA-256: 34ec7da91cfbff0edf21e575d6df522dcb62507ef62cf2cac2639495c187ec11

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic and the 'Suspicious extracted artifact' finding suggest obfuscation techniques were used within the JavaScript. The extracted JavaScript files, javascript_obj0020_000.js and javascript_obj0020_001.js, are the primary indicators of malicious activity. These scripts are likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

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 0x6147	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 0x6147	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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