I have been searching the interwebs trying to find an extractor for pfsense for graylog and have been coming up short. So I took matters into my own hands and decided to do this from scratch.
I have built the extractor using the raw filter log format located on the pfsense documentation
If you want to reap the fruits on my labor you can find the extractor on my github. If you find any issues with it, just open an issue.