You are likely correct in that this is new parser time.
If you're able to provide a good sized sample of the log it can be scheduled or you can create it yourself. The time involved to create a parser varies quite a bit by the format and consistency of the log. If there is not a standard format for the messages then a parsing rule will need to be created for each different format of message. Have you see the Custom Parser Guide? Thanks.
What you can do is to try and parse them with the linux parser as it is really generic and then assign additional parsers for the unknown events.
Also you can submit a PER McAfee KnowledgeBase - How to submit a Product Enhancement Request (PER) .