Attempt to discern where the nearest vegetation is, then expend energy to move our mass onto the object and begin absorbing it.
If it's massive like a tree, perhaps be somewhat parasitic (temper hunger slightly and eat at a somewhat slower pace) in order to get just a bit more vitality out of it than otherwise.
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You collect your body into a kind of condensed ball, and scoot your way over to the nearest tree. You wouldn't say the maneuver is
comfortable, per se, but it's definitely a better plan than waiting in a corner to starve.
Now that you've gone to all the trouble of getting yourself here, you figure you may as well spend some time thinking of a way to increase the size of your meal. You can't pull food out of thin air, but it's possible that keeping the tree alive longer than is strictly necessary might give it a chance to produce more sap.
So, instead of devouring the tree right where it stands, you crystalize a portion of your mass, drive it through the tree's bark, and leave it there, sucking up whatever comes its way.
After about an hour of sitting there, you determine that this method is, in fact, more sustainable. While the net gain doesn't even come close to sating your hunger, you are receiving a steady trickle of energy at what appears to be only moderate damage to the tree.
Unfortunately, the energy will not come indefinitely. The tree is already dying- when it goes, there will be nothing to eat but its dead husk. The process has, however, given you a useful insight. Perhaps, once you have the time energy and mass to experiment, parasitism will become a viable option.
For now, you consider your options. You have a small reserve of energy, enough to speed growth or make minor changes to your structure, if you so choose. By the same token, the tree you feed from is probably about to die- it may be a good idea to devour it now and capitalize on nutrients while they are still present.
((EDIT: Added the status spoiler. I probably shouldn't be doing this at midnight.))
The Corruption has shaped itself into a gooey ball. Part of its mass is crystalized, and has been shoved into a tree.
It is roughly a ten square inches of condensed mass, and has a small reserve of energy.
The Corruption has positioned itself next to a tree.