Critical risk detected
8 of 92 antivirus engines flag this page as malicious. Our security stack flagged multiple threat indicators on this website. Don't enter personal information, deposit money, or download files.
Is polyfill.io legit or a scam?
Polyfill.io hosts JavaScript flagged as malware by 8 antivirus engines including Emsisoft and Fortinet.
These checks passed — but they don't clear the site. A clean antivirus result, valid SSL, and a calm server only mean it isn't hosting malware; they say nothing about whether the business is real. This verdict is based on the site's conduct and content, not a malware detection.
Analysis Summary
AI Security Analysis
The site serves JavaScript resources and multiple engines in our antivirus network explicitly label it malicious or malware. Detectors such as ADMINUSLabs, Dr.Web, Emsisoft, Fortinet, and Lionic all raised alerts, producing a negative reputation score. Browser blocklists and the hosting IP show no major abuse history, but the engine detections outweigh those neutral signals. The domain has valid SSL and no redirects to suspicious locations, yet the malware flags indicate active risk. Absence of traffic ranking data further reduces confidence in its legitimacy.
Website Preview
Automated page render — captured in a safe sandbox. What an ordinary visitor would see when loading the site.
Web Research Findings
Our live research agent queries scam-report databases, consumer-review sites, news coverage, and general web search for polyfill.io, then cross-checks business-registration records and look-alike domain patterns. Everything below is pulled from what it actually found.
We searched scam-report databases, consumer-review sites, and general web sources for polyfill.io and did not find scam reports, complaints, or impersonation signals. The domain age, registration record and aggregator reviews shown above are consistent with a legitimate site.
Antivirus Engines
Security Scans
Checked against the major public blocklists used by browsers and security tools — no hits.
Domain & Encryption
Redirect Chain
- 1301http://polyfill.io/
- 2401https://polyfill.io/
Server Reputation
Scam-Type Likelihood
1 scam-type patterns detected
0 of 13 categories showed signals
We check every URL against 13 distinct scam categories so the verdict tells you not just how risky the page is, but what kind of risk it carries. Each meter pulls from page signals, web reports, our AI analyst, vision, and the scam-network cluster — not from raw AV labels.
- AI analyst tagged this as malware / drive-by / cracked app.
0 of 13 categories showed signals
We check every URL against 13 distinct scam categories so the verdict tells you not just how risky the page is, but what kind of risk it carries. Each meter pulls from page signals, web reports, our AI analyst, vision, and the scam-network cluster — not from raw AV labels.
- AI analyst tagged this as malware / drive-by / cracked app.
Malware distribution detected
Signals suggest this page may deliver malicious files or exploit the browser.
- Do not interact with polyfill.io
Do not enter credentials, deposit money, download files, or install browser extensions from this site.
- If you downloaded or ran a file from here
Disconnect the device from the internet, run a full scan with a reputable antivirus (Malwarebytes, ESET, Bitdefender), and consider a second-opinion scanner. Change passwords on any account you used from the device afterwards — ideally from a different device.
- OpenGet free cleanup help
MalwareTips has a dedicated malware-removal team who walk you through cleanup one-on-one.
Reputation Sources
How this domain rates across independent threat-intelligence and blocklist providers.
Safety FAQ
Common questions about this site, answered from the scan data on this page. These are auto-generated — not hand-written — so they always match the underlying report.
- Our automated security review flags polyfill.io as dangerous. Multiple threat indicators were detected — treat the site as a scam until proven otherwise.
- No — polyfill.io scored 1/100 on our trust scale. We detected active threat indicators, so we recommend avoiding the site entirely.
- Yes. polyfill.io presents a valid TLSv1.3 certificate issued by Let's Encrypt · E7, expiring in 78 days. Note that SSL only encrypts the connection — it does not guarantee that the site itself is trustworthy.
- 11 out of 92 antivirus engines in our malware network flagged polyfill.io as malicious or suspicious (8 outright malicious). Even one detection is a meaningful signal.
- No. polyfill.io is not currently listed on the major browser blocklist feeds that modern browsers use.
- polyfill.io resolves to an IP operated by Cloudflare, Inc. in US (usage type: Content Delivery Network). Hosting location alone doesn't make a site good or bad, but unusual geography for a brand's claimed country is one of many signals we weigh.
- We cache results for 24 hours. Signed-in MalwareTips members can trigger a manual rescan at any time using the "Rescan" button on the report page, which re-runs every check from scratch and refreshes this page.
User reviews & comments(0)
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