OK, finally figured it out – I think.
Fretboard below. D string uses index finger. A string uses middle finger for side by side frets, or ring finger when skipping a fret.
Numbers here refer to the position -- 1 is the 1st position in the sequence, 2 is in the second position and so on.
---------|---------|---------|---------|--------|---------|------------|--------|-----------|-----------|-----E
---------|---------|---------|---------|--------|---------|------------|--------|-----------|-----------|-----B
---------|---------|---------|---------|--------|---------|------------|--------|---------- |-----------|-----G
---------|---------|---------|----1----|---2----|---------|-----3-----|------- |-----4---- -|-----------|-----D
---------|---------|---------|---------|---1----|---------|-----2------|--------|----3-----|- ----4----|-----A
---------|---------|---------|---------|--------|---------|------------|--------|-------- --|-----------|-----E
So it is by fret
4 & 5 -- 5 & 7 -- 7 & 9 -- 9 & 10 -- again relative to the capo on the first fret.
Adams is hitting the open low E throughout, and it appears from time to time he hits the open G and B strings, too.
As Stanron points out, he is hammering all the way the fretboard. Finally he creates a bit of vibrato on the final fourth position up the keyboard, which comes through powerfully when amped, but can still be delivered un-amped.
For me, to move from the final E minor 7th at the end of the chorus up to the first position -- as well as hammering up the fretboard smoothly -- is quite challenging.
Another Adams example where the fingering seems simple, but is still quite demanding to get a polished controlled effect.
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