Almost looks like you had a lot of moisture build up on the walls and it dripped down. Does not look like mold. Is this a bathroom? If so, is there a vent used when taking baths and showers?
OP,
It doesn't appear to be mold. It may be some sort of stain from something on the wall such as insufficiently removed wallpaper paste that has finally bled through.
To cover this, get a really good stain blocking primer, like the best one Kilz makes. Then repaint.
Doesn't look like mold, it could be a stain from moisture perhaps..
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