AbbVie Stock Rally and Potential Sell-Off

$AbbVie (ABBV.US)$ AbbVie shares have gone up considerably during the last 2 months, and have hit record highs. Most analysts have price targets around its current value, but there are a few outliers taking AbbVie to near 170 next year.

Are we due for a correction to the downside or has the stock been undervalued severely for a couple years now and we are seeing a correction to the upside, towards its intrinsic value? I've been contemplating selling some of it lately, but it's been hard for me to pull the trigger with it going up something like 12 out of the last 15 trading days. Any thoughts on $ABBV?