I assume, the homework problem is meant to be taken literally. Although not mentioned in the post, it's apparently related to Matlab.
I guess, the signal data haven't been given originally as a *.pdf file? If they are however, you can show basic knowledge by converting it to a table file to be read-in by signal processing tools directly. Otherwise post the original file.
Secondly, you should know, what an IIR filter is. Reviewing the Matlab help file, you can get an idea how to apply a filter to the data and visualize the result.