How can I filter out phishing e-mails containing malware using Gmail?

How can I filter out phishing e-mails containing malware using Gmail?

I use gmail, and about 3 weeks ago I started getting a couple e-mails a day from random sources. All of the e-mails contain gibberish text like this:

 6 5 4 8 2586 8016 70170
  2 1 08 05 60 172 01 5463412 5410
  the stinging did working interpret our Or fire sudden of they spurts
our together of
 will they will worried be things as and take and stupid by lots
arefat  4 3 0 643 4033 8 71054 2438264 46850
  8 6 4 8 8 87 3178 375345 560723 3
  fire the working interpret together of of Or spurts they sudden
stinging our our did
 stupid lots will and will things be arefat worried take by and they

And the exact same named PDF attachment that I can only assume is malware:

The e-mails all come from different addresses and no matter how many times I report them, they come in twice a day. Is there someway I can get these filtered to my spam or trash folders in the least constraining way possible -- so people I know can still send me PDFs?