Caught it too, slightly British accented robo-voice calling numbers. Not particularly strong, and possibly not a pirate. Off around 2030z.
This is not a pirate. This is a known schedule of Russian sourced, English language, numbers station E07a. During the months of April, September, and October, Wednesday and Thursday, 2000 UTC on 8144 kHz, 2020 UTC on 6944 kHz, and 2040 UTC on 5744 kHz.
T!