It is impossible to determine which should be correct because "passed the bottom of the document" is only a fragment, so we don't know what is the subject, and more importantly for this question, what is the verb.
If 'passed' is supposed to be the verb with an implied subject, "(you) passed the bottom of the document", then 'passed' is correct. On the other hand, if 'passed' is not intended to be the verb, meaning that subject and verb are both implied, then 'past' would be correct, "(you are) past the bottom of the document".
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