To enable the extraction of a CSV file, there are a few approaches. If the data is static and the fields are always the same, you can define this per the sourcetype, refer to : http://docs.splunk.com/Documentation/Splunk/6.2.1/Data/Extractfieldsfromfileheadersatindextime#Edit_configuration_files_to_create_and_reference_source_types
Basically you would need this in your props.conf on your indexer (a UF cannot parse, just send the data..)
Generally the below is a good starting point.
[mysourcetypecsv]
FIELD_DELIMITER=,
FIELD_NAMES=myfield1,myfield2,myfield3,myfield4
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