Installing gem triggers virus scanner

```
What steps will reproduce the problem?
1. gem install origami
2. virus scanner reports Exploit:Win32/Pdfjsc.Q
3.

What is the expected output? What do you see instead?
I expect to install the gem without triggering the virus scanner

What version of the product are you using? On what operating system?
Windows 7, ruby 1.9.1, origame-1.2.2

Please provide any additional information below.
More details on the exploit:
http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Win
32/Pdfjsc

```

Original issue reported on code.google.com by `emiliano...@iris-advies.com` on 20 Oct 2011 at 7:33