If you specifically need a PDF for archival or offline use on a specialized device (like an E-ink tablet), many fans use the "Scan and Shred" (Jisui) Purchase the physical magazine. Cut the spine to separate the pages. Use a high-speed document scanner to create a personal PDF.
: Many sites claiming to offer free manga PDFs are fronts for malware, intrusive ads, or phishing. Low Quality corocoro comic pdf
The most reliable way to read CoroCoro digitally is through Shogakukan's authorized channels. These use proprietary e-readers rather than PDFs to protect copyright. CoroCoro Online : The official CoroCoro website If you specifically need a PDF for archival