PDF malware analysis — malicious · 52b1edb288ecaac6

MALICIOUS

PDF

40.2 KB Created: 2011-02-09 13:36:40 +02:00 Authoring application: Wiki Calculate Loan To Value (via mPDF 5.0)

MD5: f5dfbf8233d2a96fa5b9d7c171b934a0 SHA-1: 23b311ac7ba984b530c40a048581db386dda2c13 SHA-256: 52b1edb288ecaac6791b016864a983a114f0b3af301e5723a75f4412c4d2e55f

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1071.001 Web Protocols

The PDF file contains obfuscated JavaScript that utilizes an unescape function and a getURL redirector. This script is designed to automatically navigate the user to the URL http://searchglobalsite.com/in.cgi?11. The ML classifier strongly indicates maliciousness, and the combination of JavaScript redirection and an external URL points to a delivery mechanism for further malicious activity, such as phishing or malware download.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Obfuscated document JavaScript getURL redirector high PDF_JS_OBFUSCATED_GETURL_REDIRECTOR

PDF document-level JavaScript automatically calls getURL() on an HTTP(S) destination hidden behind percent escapes. The decoded path is a redirector-style endpoint such as /in.cgi or /go.php. This is malicious routing behavior rather than a PDF parser CVE.
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_obj0029_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9948	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_obj0029_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9948	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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