PDF malware analysis — malicious · 4d6791b90a003ec7

MALICIOUS

PDF

25.8 KB Created: 2011-01-31 13:13:55 +02:00 Authoring application: Uk Loan Rates (via mPDF 5.0)

MD5: 210275e69615d7336698b9193e295325 SHA-1: ee17165b582ec356f8698f17dd106b01413a85b0 SHA-256: 4d6791b90a003ec7123d435bf2cc622f5504198febacab1a493f024cf70acc31

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript that utilizes the unescape() function, a common technique for hiding malicious code. This script is designed to redirect the user to 'http://searchglobalsite.com/in.cgi?11', likely to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript actions and streams further supports this. The document body was unreadable, but the script's behavior is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x60DF	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 0x60DF	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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