PDF malware analysis — malicious · 57cf781254eaa697

MALICIOUS

PDF

51.8 KB Created: 2011-02-12 15:01:33 +02:00 Authoring application: No Doc Construction Loan (via mPDF 5.0)

MD5: 388018c1974448e68f2a4cf2b4053808 SHA-1: 51458f2cdd2d4f1f0fd75bc9c189c08d0dcbe078 SHA-256: 57cf781254eaa697f60f58879d7044d5ae6e2d764195b5e0fb5d2b9e7ab62558

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains obfuscated JavaScript that utilizes an unescape function, a common technique for hiding malicious code. This script is designed to redirect the user to the URL http://searchglobalsite.com/in.cgi?11. The ML classifier strongly indicates maliciousness, and the combination of JavaScript and URL redirection points to a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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_obj0034_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC740	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_obj0034_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC740	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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