ireadthebooks on "[Plugin: Wordfence Security] Possible malware alert - how do you tell?"

I, I got a warning for a possible file containing malware. How do you safely determine whether the file is infected?

Filename: wp-content/cache/wp-cache-2859b7e2fcb59b9d84187a399e9b1c5f.html
Bad URL: http://yayabamboo.com/bamboo/yayabamboo.asp?sel=bags
File type: Not a core, theme or plugin file.
Issue first detected: 46 mins ago.
Severity: Critical
Status New

"This file contains a suspected malware URL listed on Google's list of malware sites. Wordfence decodes base64 when scanning files so the URL may not be visible if you view this file. The URL is: http://yayabamboo.com/bamboo/yayabamboo.asp?sel=bags - More info available at Google Safe Browsing diagnostic page."

http://safebrowsing.clients.google.com/safebrowsing/diagnostic?site=http%3A%2F%2Fyayabamboo.com%2Fbamboo%2Fyayabamboo.asp%3Fsel%3Dbags%5D&client=googlechrome&hl=en-US

https://wordpress.org/plugins/wordfence/