I uploaded the file to virustotal.com, and Trend Micro is the only of 53 used scanners that detects anything.
Taking into account the term HEURistic in the reported result and the really vague detail information of the "virus" I would safely assume everything is fine (not mentioning that the file is more than 10 years old, thus if the file really did something bad it would have waited a real long time).
Betreff: [protext] Virus warning for ProTexXt-3.1.4-020114.exe
Datum: Sat, 18 Oct 2014 23:41:26 +0200
Von: "jdc...@sccoast.net ." <jdc...@sccoast.net>
Affected file: Downloads\ProTeX\MiKTeX\tm\packages\ecards.cab\eCardstst.pdf
More Information: http://about-threats.trendmicro.com/apac/malware/heur_pdfexp.b