Neither can I. linux's file identifies it as PDF document, version 1.4, but KDE's okular says:

Syntax Error: Invalid XRef entry Internal Error: xref num 229 not found but needed, try to reconstruct<0a> Syntax Error: Invalid XRef entry Syntax Error: Top-level pages object is wrong type (null) Command Line Error: Wrong page range given: the first page (1) can not be after the last page (0).

Seems like it is damaged but some readers deal better with it than others