The OP links to a related article:
http://www.thedrive.com/the-war-zone/16079/airliners-and-f-15s-involved-in-bizzare-encounter-with-mystery-aircraft-over-oregon
And that related article features a recording of air traffic in the area trying to identify the craft:
“You can listen to the entire series of exchanges here starting at around the 20 minute mark (http://archive-server.liveatc.net/kmfr/ZSE-KMFR-14-15-Oct-25-2017-0030Z.mp3) and through to the first part of the next time interval recording that can be found here (http://archive-server.liveatc.net/kmfr/ZSE-KMFR-14-Oct-25-2017-0100Z.mp3).";
Was that you Fred?