The script could trigger a false positive, but you may also be infected without your knowledge with a virus that escapes your AV utility.
You may want to test your installer package and your program files with Virustotal, where your files will be tested with several different engines. You will have a better confidence level that it is (or not) a false positive.
When I last checked a file on VirusTotal, the following engines scanned my file:
ALYac, AVG, AVware, Ad-Aware, AegisLab, Agnitum, AhnLab-V3, Alibaba, Antiy-AVL, Arcabit, Avast, Avira, Baidu-International
BitDefender, Bkav, ByteHero, CAT-QuickHeal , CMC, ClamAV, Comodo, Cyren, DrWeb, ESET-NOD32, Emsisoft, F-Prot, F-Secure
Fortinet, GData, Ikarus, Jiangmin, K7AntiVirus, K7GW, Kaspersky, Kingsoft, Malwarebytes, McAfee, McAfee-GW-Edition,
MicroWorld-eScan, Microsoft, NANO-Antivirus, Panda, Qihoo-360, Rising, SUPERAntiSpyware, Sophos, Symantec, Tencent , TheHacker
TrendMicro, TrendMicro-HouseCall, VBA32, VIPRE, ViRobot, Zillya, Zoner, nProtect
All of the engine signatures were recently updated. If your files do not reveal a virus after all these scans, then you can reasonably claim that your program install package is OK.