Eclipsed (but visible) satellite

[Pixies]

I was just looking out the back door and saw an odd sight. 2 bright stars low in the north west. Realizing the brightest one was Vega, I could see the other moving. It was as bright as the ISS can be (obviously in the wrong direction). It rose close past Vega, fading all the time, and kept on going until it disappeared around 35 - 40deg alt.

As I had nothing better to do, I made a note of the time (21:22) and then used SatFlare to work out what satellite it was - SL-6 R/B(2). So I confirmed it on Stellarium - and it matched exactly the  path I saw. However, it says that this satellite was eclipsed at the time, and indeed - it's not a time or direction that I'd normally expect to see something, which was why I was interested in the first place.

Could it have been reflecting light from the nearly full moon?