Friction is a main cause of electrostatic generation, caused by the repeated joining and separation that takes place when insulators are rubbed together. Both the acrylic and the rubber are insulators and some way apart in the triboelectric series. You would expect the jumper to charge positively, and the balloon rubber to charge negatively.
The charged balloon would stick to anything with an opposite charge, but the static charge generated will gradually dissipate with time, so that the attraction gradually disappears. The rate of discharge is slow, because the materials of both wall and balloon are good insulators.
Practical hints if you want to try this:
[At this stage we have explained why the balloon might stick to the jumper , but not why it sticks to the wall – be patient, and all will be revealed!]
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