There is a fairly straightforward way to accomplish this--download the Blue Coat Reporter app, install it on a server, and have it download the WSS/ThreatPulse logs automatically. Those logs come down in gzip format, but can be indexed easily by Splunk--the format is similar to the standard ProxySG log formats.
Here's an article from Symantec on setting up the connection between Reporter and ThreatPulse: https://support.symantec.com/en_US/article.TECH241105.html
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