Now he took it even a level further: you can be vulnerable by just having an infected file. The problem lies with the Windows Indexing Service.
Here is still a list of possible countermeasures:
- An up-to-date anti-virus.
- Host-based IDS/IPS signatures.
- Disable automatic rendering of PDFs in the browser
- Use an alternative PDF reader like Foxit Reader or Sumatra PDF.
- Disable or deinstall windows indexing service.