The Brazilian conglomerate plans to raise cash and use its shares in petrochemical company Braskem as guarantee.
As of Tuesday afternoon, no group has claimed responsibility for the attack.
Financing of the US$791mn highway, part of the 4G program, froze due to a local community's opposition to the installation of a toll station.
The entity in charge of the US$1.5bn project will hold its next meeting on February 21 to discuss the shortlist.
Four years after the concession had been awarded, and following a complicated environmental assessment process, early works have finally started with main construction set to begin next month.