I tried scanning with
http://www.virustotal.com/ (trustworthy results, cos many different AVs used for scan)
Using antidebug loader in all four cases:
With only the IsDebuggerPresent Hook plugin: 16.67% suspicious
Without any hook plugins: 16.67% .. exactly the same
With / without extra codecs .. same result again.
Using default loader, and EAD loader, with default settings (no hooks or codecs) also same results ..
So, 83% safe results from multiple antivirus scans suggests the Avira scanner is at fault.
