Access to the requested URL was blocked

While trying to access the URL:
/wp-content/uploads/2014/01/20134.pdf
The content is blocked for the following condition:
dnsrbl
Additional information:
Client is listed on DNSRBL fur.cal1.sophosxl.com
This incident was logged with the following log identifier:
ZiFCx4uFUvQypsWQ3AoV0wAAAEg
Your cache administrator is:
odtabien@neda.gov.ph