Stretch as good shape
Assuming Black is strong in the centre, which is quite likely in positions leading to the initial formation, this is dangerous for White. Black also has an option of playing 6 and 8 in the other order; or playing bluntly to cut starting at b. Holding back one line makes good sense.
The weakness explained above for the one-point jump does occur in a common contemporary joseki, after one follow-up play.
These are standard plays when the marked white stone is a wedge on Black's nirensei or orthodox fuseki side, and Black's marked stone a checking extension. Black 6 resists when White 5 slides. When later Black returns to play at a, White has a problem with shape exactly as before. White can correct it by playing the butt b; possibly too crude and aji keshi, though. For a game example of the cut occurring in this shape, see Ch'oe Myeong-hun-Zhou Junxun 2001-07-07 in the Fujitsu Cup.