Extract only the subject and recipients from a mailbox

Guys,

I work with Exchange and need some guidance please. I have been tasked to pull two fields if it meets the following conditions.

If the subject contains for example "bigbadwolf" and with this pull the recipients of that email. I have used the new-importmailboxrequest but this only extracts to a pst file. Not sure if the get-mailbox -identity "nameofmailbox" | search-mailbox could pull this info into a csv file. Any input would be awesome